dojo.require("dojo._base.lang");
dojo.provide("dojo._base.html");

// FIXME: need to add unit tests for all the semi-public methods

try{
	document.execCommand("BackgroundImageCache", false, true);
}catch(e){
	// sane browsers don't have cache "issues"
}

// =============================
// DOM Functions
// =============================

/*=====
dojo.byId = function(id, doc){
	//	summary:
	//		Returns DOM node with matching `id` attribute or `null` 
	//		if not found, similar to "$" function in another library.
	//		If `id` is a DomNode, this function is a no-op.
	//
	//	id: String|DOMNode
	//	 	A string to match an HTML id attribute or a reference to a DOM Node
	//
	//	doc: Document?
	//		Document to work in. Defaults to the current value of
	//		dojo.doc.  Can be used to retrieve
	//		node references from other documents.
=====*/
if(dojo.isIE || dojo.isOpera){
	dojo.byId = function(id, doc){
		if(dojo.isString(id)){
			var _d = doc || dojo.doc;
			var te = _d.getElementById(id);
			// attributes.id.value is better than just id in case the 
			// user has a name=id inside a form
			if(te && te.attributes.id.value == id){
				return te;
			}else{
				var eles = _d.all[id];
				if(!eles || !eles.length){ return eles; }
				// if more than 1, choose first with the correct id
				var i=0;
				while((te=eles[i++])){
					if(te.attributes.id.value == id){ return te; }
				}
			}
		}else{
			return id; // DomNode
		}
	}
}else{
	dojo.byId = function(id, doc){
		return dojo.isString(id) ? (doc || dojo.doc).getElementById(id) : id; // DomNode
	}
}
/*=====
}
=====*/

(function(){
	var d = dojo;

	var _destroyContainer = null;
	dojo.addOnWindowUnload(function(){
		_destroyContainer=null; //prevent IE leak
	});

	dojo._destroyElement = function(/*String||DomNode*/node){
		// summary:
		//		removes node from its parent, clobbers it and all of its
		//		children.
		//	node:
		//		the element to be destroyed, either as an ID or a reference

		node = d.byId(node);
		try{
			if(!_destroyContainer || _destroyContainer.ownerDocument != node.ownerDocument){
				_destroyContainer = node.ownerDocument.createElement("div");
			}
			_destroyContainer.appendChild(node.parentNode ? node.parentNode.removeChild(node) : node);
			// NOTE: see http://trac.dojotoolkit.org/ticket/2931. This may be a bug and not a feature
			_destroyContainer.innerHTML = ""; 
		}catch(e){
			/* squelch */
		}
	};

	dojo.isDescendant = function(/*DomNode|String*/node, /*DomNode|String*/ancestor){
		//	summary:
		//		Returns true if node is a descendant of ancestor
		//	node: id or node reference to test
		//	ancestor: id or node reference of potential parent to test against
		try{
			node = d.byId(node);
			ancestor = d.byId(ancestor);
			while(node){
				if(node === ancestor){
					return true; // Boolean
				}
				node = node.parentNode;
			}
		}catch(e){ /* squelch, return false */ }
		return false; // Boolean
	};

	dojo.setSelectable = function(/*DomNode|String*/node, /*Boolean*/selectable){
		//	summary: enable or disable selection on a node
		//	node:
		//		id or reference to node
		//	selectable:
		node = d.byId(node);
		if(d.isMozilla){
			node.style.MozUserSelect = selectable ? "" : "none";
		}else if(d.isKhtml){
			node.style.KhtmlUserSelect = selectable ? "auto" : "none";
		}else if(d.isIE){
			var v = (node.unselectable = selectable ? "" : "on");
			d.query("*", node).forEach("item.unselectable = '"+v+"'");
		}
		//FIXME: else?  Opera?
	};

	var _insertBefore = function(/*Node*/node, /*Node*/ref){
		ref.parentNode.insertBefore(node, ref);
		return true;	//	boolean
	}

	var _insertAfter = function(/*Node*/node, /*Node*/ref){
		//	summary:
		//		Try to insert node after ref
		var pn = ref.parentNode;
		if(ref == pn.lastChild){
			pn.appendChild(node);
		}else{
			return _insertBefore(node, ref.nextSibling);	//	boolean
		}
		return true;	//	boolean
	}

	dojo.place = function(/*String|DomNode*/node, /*String|DomNode*/refNode, /*String?|Number?*/position){
		//	summary:
		//		Attempt to insert node into the DOM, choosing from various positioning options.
		//		Returns true if successful, false otherwise.
		//	node: 
		//		id or node reference to place relative to refNode
		//	refNode: 
		//		id or node reference to use as basis for placement
		//	position:
		//		string noting the position of node relative to refNode or a
		//		number indicating the location in the childNodes collection of refNode. 
		//		Accepted string values are:
		//		* before
		//		* after
		//		* first
		//		* last
		//
		//		"first" and "last" indicate positions as children of refNode.  position defaults
		//		to "last" if not specified

		// FIXME: need to write tests for this!!!!
		if(!node || !refNode){
			return false;	//	boolean 
		}
		node = d.byId(node);
		refNode = d.byId(refNode);
		if(typeof position == "number"){
			var cn = refNode.childNodes;
			if(!cn.length || cn.length <= position){
				refNode.appendChild(node);
				return true;
			}
			return _insertBefore(node, position <= 0 ? refNode.firstChild : cn[position]);
		}
		switch(position){
			case "before":
				return _insertBefore(node, refNode);	//	boolean
			case "after":
				return _insertAfter(node, refNode);		//	boolean
			case "first":
				if(refNode.firstChild){
					return _insertBefore(node, refNode.firstChild);	//	boolean
				}
				// else fallthrough...
			default: // aka: last
				refNode.appendChild(node);
				return true;	//	boolean
		}
	}

	// Box functions will assume this model.
	// On IE/Opera, BORDER_BOX will be set if the primary document is in quirks mode.
	// Can be set to change behavior of box setters.
	
	// can be either:
	//	"border-box"
	//	"content-box" (default)
	dojo.boxModel = "content-box";
	
	// We punt per-node box mode testing completely.
	// If anybody cares, we can provide an additional (optional) unit 
	// that overrides existing code to include per-node box sensitivity.

	// Opera documentation claims that Opera 9 uses border-box in BackCompat mode.
	// but experiments (Opera 9.10.8679 on Windows Vista) indicate that it actually continues to use content-box.
	// IIRC, earlier versions of Opera did in fact use border-box.
	// Opera guys, this is really confusing. Opera being broken in quirks mode is not our fault.

	if(d.isIE /*|| dojo.isOpera*/){
		var _dcm = document.compatMode;
		// client code may have to adjust if compatMode varies across iframes
		d.boxModel = _dcm == "BackCompat" || _dcm == "QuirksMode" || d.isIE<6 ? "border-box" : "content-box"; // FIXME: remove IE < 6 support?
	}

	// =============================
	// Style Functions
	// =============================
	
	// getComputedStyle drives most of the style code.
	// Wherever possible, reuse the returned object.
	//
	// API functions below that need to access computed styles accept an 
	// optional computedStyle parameter.
	// If this parameter is omitted, the functions will call getComputedStyle themselves.
	// This way, calling code can access computedStyle once, and then pass the reference to 
	// multiple API functions. 

/*=====
	dojo.getComputedStyle = function(node){
		//	summary:
		//		Returns a "computed style" object.
		//
		//	description:
		//		Gets a "computed style" object which can be used to gather
		//		information about the current state of the rendered node. 
		//
		//		Note that this may behave differently on different browsers.
		//		Values may have different formats and value encodings across
		//		browsers.
		//
		//		Note also that this method is expensive.  Wherever possible,
		//		reuse the returned object.
		//
		//		Use the dojo.style() method for more consistent (pixelized)
		//		return values.
		//
		//	node: DOMNode
		//		A reference to a DOM node. Does NOT support taking an
		//		ID string for speed reasons.
		//	example:
		//	|	dojo.getComputedStyle(dojo.byId('foo')).borderWidth;
		return; // CSS2Properties
	}
=====*/

	// Although we normally eschew argument validation at this
	// level, here we test argument 'node' for (duck)type.
	// Argument node must also implement Element.  (Note: we check
	// against HTMLElement rather than Element for interop with prototype.js)
	// Because 'document' is the 'parentNode' of 'body'
	// it is frequently sent to this function even 
	// though it is not Element.
	var gcs;
	if(d.isSafari){
		gcs = function(/*DomNode*/node){
			var s;
			if(node instanceof HTMLElement){
				var dv = node.ownerDocument.defaultView;
				s = dv.getComputedStyle(node, null);
				if(!s && node.style){ 
					node.style.display = ""; 
					s = dv.getComputedStyle(node, null);
				}
			}
			return s || {};
		}; 
	}else if(d.isIE){
		gcs = function(node){
			// IE (as of 7) doesn't expose Element like sane browsers
			return node.nodeType == 1 /* ELEMENT_NODE*/ ? node.currentStyle : {};
		};
	}else{
		gcs = function(node){
			return node instanceof HTMLElement ? 
				node.ownerDocument.defaultView.getComputedStyle(node, null) : {};
		};
	}
	dojo.getComputedStyle = gcs;

	if(!d.isIE){
		dojo._toPixelValue = function(element, value){
			// style values can be floats, client code may want
			// to round for integer pixels.
			return parseFloat(value) || 0; 
		};
	}else{
		dojo._toPixelValue = function(element, avalue){
			if(!avalue){ return 0; }
			// on IE7, medium is usually 4 pixels
			if(avalue=="medium"){ return 4; }
			// style values can be floats, client code may
			// want to round this value for integer pixels.
			if(avalue.slice && (avalue.slice(-2)=='px')){ return parseFloat(avalue); }
			with(element){
				var sLeft = style.left;
				var rsLeft = runtimeStyle.left;
				runtimeStyle.left = currentStyle.left;
				try{
					// 'avalue' may be incompatible with style.left, which can cause IE to throw
					// this has been observed for border widths using "thin", "medium", "thick" constants
					// those particular constants could be trapped by a lookup
					// but perhaps there are more
					style.left = avalue;
					avalue = style.pixelLeft;
				}catch(e){
					avalue = 0;
				}
				style.left = sLeft;
				runtimeStyle.left = rsLeft;
			}
			return avalue;
		}
	}
	var px = d._toPixelValue;

	// FIXME: there opacity quirks on FF that we haven't ported over. Hrm.
	/*=====
	dojo._getOpacity = function(node){
			//	summary:
			//		Returns the current opacity of the passed node as a
			//		floating-point value between 0 and 1.
			//	node: DomNode
			//		a reference to a DOM node. Does NOT support taking an
			//		ID string for speed reasons.
			//	returns: Number between 0 and 1
			return; // Number
	}
	=====*/

	var astr = "DXImageTransform.Microsoft.Alpha";
	var af = function(n, f){ 
		try{
			return n.filters.item(astr);
		}catch(e){
			return f ? {} : null;
		}
	}

	dojo._getOpacity = d.isIE ? function(node){
		try{
			return af(node).Opacity / 100; // Number
		}catch(e){
			return 1; // Number
		}
	} : function(node){
		return gcs(node).opacity;
	};

	/*=====
	dojo._setOpacity = function(node, opacity){
			//	summary:
			//		set the opacity of the passed node portably. Returns the
			//		new opacity of the node.
			//	node: DOMNode
			//		a reference to a DOM node. Does NOT support taking an
			//		ID string for performance reasons.
			//	opacity: Number
			//		A Number between 0 and 1. 0 specifies transparent.
			//	returns: Number between 0 and 1
			return; // Number
	}
	=====*/

	dojo._setOpacity = d.isIE ? function(/*DomNode*/node, /*Number*/opacity){
		var ov = opacity * 100;
		node.style.zoom = 1.0;

		// on IE7 Alpha(Filter opacity=100) makes text look fuzzy so disable it altogether (bug #2661),
		//but still update the opacity value so we can get a correct reading if it is read later.
		af(node, 1).Enabled = (opacity == 1 ? false : true);

		if(!af(node)){
			node.style.filter += " progid:"+astr+"(Opacity="+ov+")";
		}else{
			af(node, 1).Opacity = ov;
		}

		if(node.nodeName.toLowerCase() == "tr"){
			d.query("> td", node).forEach(function(i){
				d._setOpacity(i, opacity);
			});
		}
		return opacity;
	} : function(node, opacity){
		return node.style.opacity = opacity;
	};

	var _pixelNamesCache = {
		left: true, top: true
	};
	var _pixelRegExp = /margin|padding|width|height|max|min|offset/;  // |border
	var _toStyleValue = function(node, type, value){
		type = type.toLowerCase(); // FIXME: should we really be doing string case conversion here? Should we cache it? Need to profile!
		if(d.isIE){
			if(value == "auto"){
				if(type == "height"){ return node.offsetHeight; }
				if(type == "width"){ return node.offsetWidth; }
			}
			if(type == "fontweight"){
				switch(value){
					case 700: return "bold";
					case 400:
					default: return "normal";
				}
			}
		}
		if(!(type in _pixelNamesCache)){
			_pixelNamesCache[type] = _pixelRegExp.test(type);
		}
		return _pixelNamesCache[type] ? px(node, value) : value;
	}

	var _floatStyle = d.isIE ? "styleFloat" : "cssFloat";
	var _floatAliases = { "cssFloat": _floatStyle, "styleFloat": _floatStyle, "float": _floatStyle };
	
	// public API
	
	dojo.style = function(	/*DomNode|String*/ node, 
							/*String?|Object?*/ style, 
							/*String?*/ value){
		//	summary:
		//		Accesses styles on a node. If 2 arguments are
		//		passed, acts as a getter. If 3 arguments are passed, acts
		//		as a setter.
		//	node:
		//		id or reference to node to get/set style for
		//	style:
		//		the style property to set in DOM-accessor format
		//		("borderWidth", not "border-width") or an object with key/value
		//		pairs suitable for setting each property.
		//	value:
		//		If passed, sets value on the node for style, handling
		//		cross-browser concerns.
		//	example:
		//		Passing only an ID or node returns the computed style object of
		//		the node:
		//	|	dojo.style("thinger");
		//	example:
		//		Passing a node and a style property returns the current
		//		normalized, computed value for that property:
		//	|	dojo.style("thinger", "opacity"); // 1 by default
		//
		//	example:
		//		Passing a node, a style property, and a value changes the
		//		current display of the node and returns the new computed value
		//	|	dojo.style("thinger", "opacity", 0.5); // == 0.5
		//
		//	example:
		//		Passing a node, an object-style style property sets each of the values in turn and returns the computed style object of the node:
		//	|	dojo.style("thinger", {
		//	|		"opacity": 0.5,
		//	|		"border": "3px solid black",
		//	|		"height": 300
		//	|	});
		//
		// 	example:
		//		When the CSS style property is hyphenated, the JavaScript property is camelCased.
		//		font-size becomes fontSize, and so on.
		//	|	dojo.style("thinger",{
		//	|		fontSize:"14pt",
		//	|		letterSpacing:"1.2em"
		//	|	});
		//
		//	example:
		//		dojo.NodeList implements .style() using the same syntax, omitting the "node" parameter, calling
		//		dojo.style() on every element of the list. See: dojo.query and dojo.NodeList
		//	|	dojo.query(".someClassName").style("visibility","hidden");
		//	|	// or
		//	|	dojo.query("#baz > div").style({
		//	|		opacity:0.75,
		//	|		fontSize:"13pt"
		//	|	});

		var n = d.byId(node), args = arguments.length, op = (style=="opacity");
		style = _floatAliases[style] || style;
		if(args == 3){
			return op ? d._setOpacity(n, value) : n.style[style] = value; /*Number*/
		}
		if(args == 2 && op){
			return d._getOpacity(n);
		}
		var s = gcs(n);
		if(args == 2 && !d.isString(style)){
			for(var x in style){
				d.style(node, x, style[x]);
			}
			return s;
		}
		return (args == 1) ? s : _toStyleValue(n, style, s[style]||n.style[style]); /* CSS2Properties||String||Number */
	}

	// =============================
	// Box Functions
	// =============================

	dojo._getPadExtents = function(/*DomNode*/n, /*Object*/computedStyle){
		//	summary:
		// 		Returns object with special values specifically useful for node
		// 		fitting.
		//
		// 		* l/t = left/top padding (respectively)
		// 		* w = the total of the left and right padding 
		// 		* h = the total of the top and bottom padding
		//
		//		If 'node' has position, l/t forms the origin for child nodes. 
		//		The w/h are used for calculating boxes.
		//		Normally application code will not need to invoke this
		//		directly, and will use the ...box... functions instead.
		var 
			s = computedStyle||gcs(n), 
			l = px(n, s.paddingLeft), 
			t = px(n, s.paddingTop);
		return { 
			l: l,
			t: t,
			w: l+px(n, s.paddingRight),
			h: t+px(n, s.paddingBottom)
		};
	}

	dojo._getBorderExtents = function(/*DomNode*/n, /*Object*/computedStyle){
		//	summary:
		//		returns an object with properties useful for noting the border
		//		dimensions.
		//
		// 		* l/t = the sum of left/top border (respectively)
		//		* w = the sum of the left and right border
		//		* h = the sum of the top and bottom border
		//
		//		The w/h are used for calculating boxes.
		//		Normally application code will not need to invoke this
		//		directly, and will use the ...box... functions instead.
		var 
			ne = "none",
			s = computedStyle||gcs(n), 
			bl = (s.borderLeftStyle != ne ? px(n, s.borderLeftWidth) : 0),
			bt = (s.borderTopStyle != ne ? px(n, s.borderTopWidth) : 0);
		return { 
			l: bl,
			t: bt,
			w: bl + (s.borderRightStyle!=ne ? px(n, s.borderRightWidth) : 0),
			h: bt + (s.borderBottomStyle!=ne ? px(n, s.borderBottomWidth) : 0)
		};
	}

	dojo._getPadBorderExtents = function(/*DomNode*/n, /*Object*/computedStyle){
		//	summary:
		//		returns object with properties useful for box fitting with
		//		regards to padding.
		//
		//		* l/t = the sum of left/top padding and left/top border (respectively)
		//		* w = the sum of the left and right padding and border
		//		* h = the sum of the top and bottom padding and border
		//
		//		The w/h are used for calculating boxes.
		//		Normally application code will not need to invoke this
		//		directly, and will use the ...box... functions instead.
		var 
			s = computedStyle||gcs(n), 
			p = d._getPadExtents(n, s),
			b = d._getBorderExtents(n, s);
		return { 
			l: p.l + b.l,
			t: p.t + b.t,
			w: p.w + b.w,
			h: p.h + b.h
		};
	}

	dojo._getMarginExtents = function(n, computedStyle){
		//	summary:
		//		returns object with properties useful for box fitting with
		//		regards to box margins (i.e., the outer-box).
		//
		//		* l/t = marginLeft, marginTop, respectively
		//		* w = total width, margin inclusive
		//		* h = total height, margin inclusive
		//
		//		The w/h are used for calculating boxes.
		//		Normally application code will not need to invoke this
		//		directly, and will use the ...box... functions instead.
		var 
			s = computedStyle||gcs(n), 
			l = px(n, s.marginLeft),
			t = px(n, s.marginTop),
			r = px(n, s.marginRight),
			b = px(n, s.marginBottom);
		if(d.isSafari && (s.position != "absolute")){
			// FIXME: Safari's version of the computed right margin
			// is the space between our right edge and the right edge 
			// of our offsetParent. 
			// What we are looking for is the actual margin value as 
			// determined by CSS.
			// Hack solution is to assume left/right margins are the same.
			r = l;
		}
		return { 
			l: l,
			t: t,
			w: l+r,
			h: t+b
		};
	}

	// Box getters work in any box context because offsetWidth/clientWidth
	// are invariant wrt box context
	//
	// They do *not* work for display: inline objects that have padding styles
	// because the user agent ignores padding (it's bogus styling in any case)
	//
	// Be careful with IMGs because they are inline or block depending on 
	// browser and browser mode.

	// Although it would be easier to read, there are not separate versions of 
	// _getMarginBox for each browser because:
	// 1. the branching is not expensive
	// 2. factoring the shared code wastes cycles (function call overhead)
	// 3. duplicating the shared code wastes bytes
	
	dojo._getMarginBox = function(/*DomNode*/node, /*Object*/computedStyle){
		// summary:
		//		returns an object that encodes the width, height, left and top
		//		positions of the node's margin box.
		var s = computedStyle||gcs(node), me = d._getMarginExtents(node, s);
		var l = node.offsetLeft - me.l, t = node.offsetTop - me.t, p = node.parentNode;
		if(d.isMoz){
			// Mozilla:
			// If offsetParent has a computed overflow != visible, the offsetLeft is decreased
			// by the parent's border.
			// We don't want to compute the parent's style, so instead we examine node's
			// computed left/top which is more stable.
			var sl = parseFloat(s.left), st = parseFloat(s.top);
			if(!isNaN(sl) && !isNaN(st)){
				l = sl, t = st;
			}else{
				// If child's computed left/top are not parseable as a number (e.g. "auto"), we
				// have no choice but to examine the parent's computed style.
				if(p && p.style){
					var pcs = gcs(p);
					if(pcs.overflow != "visible"){
						var be = d._getBorderExtents(p, pcs);
						l += be.l, t += be.t;
					}
				}
			}
		}else if(d.isOpera){
			// On Opera, offsetLeft includes the parent's border
			if(p){
				var be = d._getBorderExtents(p);
				l -= be.l;
				t -= be.t;
			}
		}
		return { 
			l: l, 
			t: t, 
			w: node.offsetWidth + me.w, 
			h: node.offsetHeight + me.h 
		};
	}
	
	dojo._getContentBox = function(node, computedStyle){
		// summary:
		//		Returns an object that encodes the width, height, left and top
		//		positions of the node's content box, irrespective of the
		//		current box model.

		// clientWidth/Height are important since the automatically account for scrollbars
		// fallback to offsetWidth/Height for special cases (see #3378)
		var s=computedStyle||gcs(node), pe=d._getPadExtents(node, s), be=d._getBorderExtents(node, s), w=node.clientWidth, h;
		if(!w){
			w=node.offsetWidth, h=node.offsetHeight;
		}else{
			h=node.clientHeight, be.w = be.h = 0; 
		}
		// On Opera, offsetLeft includes the parent's border
		if(d.isOpera){ pe.l += be.l; pe.t += be.t; };
		return { 
			l: pe.l, 
			t: pe.t, 
			w: w - pe.w - be.w, 
			h: h - pe.h - be.h
		};
	}

	dojo._getBorderBox = function(node, computedStyle){
		var s=computedStyle||gcs(node), pe=d._getPadExtents(node, s), cb=d._getContentBox(node, s);
		return { 
			l: cb.l - pe.l, 
			t: cb.t - pe.t, 
			w: cb.w + pe.w, 
			h: cb.h + pe.h
		};
	}

	// Box setters depend on box context because interpretation of width/height styles
	// vary wrt box context.
	//
	// The value of dojo.boxModel is used to determine box context.
	// dojo.boxModel can be set directly to change behavior.
	//
	// Beware of display: inline objects that have padding styles
	// because the user agent ignores padding (it's a bogus setup anyway)
	//
	// Be careful with IMGs because they are inline or block depending on 
	// browser and browser mode.
	// 
	// Elements other than DIV may have special quirks, like built-in
	// margins or padding, or values not detectable via computedStyle.
	// In particular, margins on TABLE do not seems to appear 
	// at all in computedStyle on Mozilla.
	
	dojo._setBox = function(/*DomNode*/node, /*Number?*/l, /*Number?*/t, /*Number?*/w, /*Number?*/h, /*String?*/u){
		//	summary:
		//		sets width/height/left/top in the current (native) box-model
		//		dimentions. Uses the unit passed in u.
		//	node: DOM Node reference. Id string not supported for performance reasons.
		//	l: optional. left offset from parent.
		//	t: optional. top offset from parent.
		//	w: optional. width in current box model.
		//	h: optional. width in current box model.
		//	u: optional. unit measure to use for other measures. Defaults to "px".
		u = u || "px";
		var s = node.style;
		if(!isNaN(l)){ s.left = l+u; }
		if(!isNaN(t)){ s.top = t+u; }
		if(w>=0){ s.width = w+u; }
		if(h>=0){ s.height = h+u; }
	}

	dojo._isButtonTag = function(/*DomNode*/node) {
		// summary:
		//		True if the node is BUTTON or INPUT.type="button".
		return node.tagName == "BUTTON" 
			|| node.tagName=="INPUT" && node.getAttribute("type").toUpperCase() == "BUTTON"; // boolean
	}
	
	dojo._usesBorderBox = function(/*DomNode*/node){
		//	summary: 
		//		True if the node uses border-box layout.

		// We could test the computed style of node to see if a particular box
		// has been specified, but there are details and we choose not to bother.
		
		// TABLE and BUTTON (and INPUT type=button) are always border-box by default.
		// If you have assigned a different box to either one via CSS then
		// box functions will break.
		
		var n = node.tagName;
		return d.boxModel=="border-box" || n=="TABLE" || dojo._isButtonTag(node); // boolean
	}

	dojo._setContentSize = function(/*DomNode*/node, /*Number*/widthPx, /*Number*/heightPx, /*Object*/computedStyle){
		//	summary:
		//		Sets the size of the node's contents, irrespective of margins,
		//		padding, or borders.
		if(d._usesBorderBox(node)){
			var pb = d._getPadBorderExtents(node, computedStyle);
			if(widthPx >= 0){ widthPx += pb.w; }
			if(heightPx >= 0){ heightPx += pb.h; }
		}
		d._setBox(node, NaN, NaN, widthPx, heightPx);
	}

	dojo._setMarginBox = function(/*DomNode*/node, 	/*Number?*/leftPx, /*Number?*/topPx, 
													/*Number?*/widthPx, /*Number?*/heightPx, 
													/*Object*/computedStyle){
		//	summary:
		//		sets the size of the node's margin box and placement
		//		(left/top), irrespective of box model. Think of it as a
		//		passthrough to dojo._setBox that handles box-model vagaries for
		//		you.

		var s = computedStyle||gcs(node);
		// Some elements have special padding, margin, and box-model settings. 
		// To use box functions you may need to set padding, margin explicitly.
		// Controlling box-model is harder, in a pinch you might set dojo.boxModel.
		var bb=d._usesBorderBox(node),
				pb=bb ? _nilExtents : d._getPadBorderExtents(node, s);
		if (dojo.isSafari) {
			// on Safari (3.1.2), button nodes with no explicit size have a default margin
			// setting an explicit size eliminates the margin.
			// We have to swizzle the width to get correct margin reading.
			if (dojo._isButtonTag(node)){
				var ns = node.style;
				if (widthPx>=0 && !ns.width) { ns.width = "4px"; }
				if (heightPx>=0 && !ns.height) { ns.height = "4px"; }
			}
		}
		var mb=d._getMarginExtents(node, s);
		if(widthPx>=0){ widthPx = Math.max(widthPx - pb.w - mb.w, 0); }
		if(heightPx>=0){ heightPx = Math.max(heightPx - pb.h - mb.h, 0); }
		d._setBox(node, leftPx, topPx, widthPx, heightPx);
	}
	
	var _nilExtents = { l:0, t:0, w:0, h:0 };

	// public API
	
	dojo.marginBox = function(/*DomNode|String*/node, /*Object?*/box){
		//	summary:
		//		Getter/setter for the margin-box of node.
		//	description: 
		//		Returns an object in the expected format of box (regardless
		//		if box is passed). The object might look like:
		//			`{ l: 50, t: 200, w: 300: h: 150 }`
		//		for a node offset from its parent 50px to the left, 200px from
		//		the top with a margin width of 300px and a margin-height of
		//		150px.
		//	node:
		//		id or reference to DOM Node to get/set box for
		//	box:
		//		If passed, denotes that dojo.marginBox() should
		//		update/set the margin box for node. Box is an object in the
		//		above format. All properties are optional if passed.
		var n=d.byId(node), s=gcs(n), b=box;
		return !b ? d._getMarginBox(n, s) : d._setMarginBox(n, b.l, b.t, b.w, b.h, s); // Object
	}

	dojo.contentBox = function(/*DomNode|String*/node, /*Object?*/box){
		//	summary:
		//		Getter/setter for the content-box of node.
		//	description:
		//		Returns an object in the expected format of box (regardless if box is passed).
		//		The object might look like:
		//			`{ l: 50, t: 200, w: 300: h: 150 }`
		//		for a node offset from its parent 50px to the left, 200px from
		//		the top with a content width of 300px and a content-height of
		//		150px. Note that the content box may have a much larger border
		//		or margin box, depending on the box model currently in use and
		//		CSS values set/inherited for node.
		//	node:
		//		id or reference to DOM Node to get/set box for
		//	box:
		//		If passed, denotes that dojo.contentBox() should
		//		update/set the content box for node. Box is an object in the
		//		above format. All properties are optional if passed.
		var n=d.byId(node), s=gcs(n), b=box;
		return !b ? d._getContentBox(n, s) : d._setContentSize(n, b.w, b.h, s); // Object
	}
	
	// =============================
	// Positioning 
	// =============================
	
	var _sumAncestorProperties = function(node, prop){
		if(!(node = (node||0).parentNode)){return 0};
		var val, retVal = 0, _b = d.body();
		while(node && node.style){
			if(gcs(node).position == "fixed"){
				return 0;
			}
			val = node[prop];
			if(val){
				retVal += val - 0;
				// opera and khtml #body & #html has the same values, we only
				// need one value
				if(node == _b){ break; }
			}
			node = node.parentNode;
		}
		return retVal;	//	integer
	}

	dojo._docScroll = function(){
		var 
			_b = d.body(),
			_w = d.global,
			de = d.doc.documentElement;
		return {
			y: (_w.pageYOffset || de.scrollTop || _b.scrollTop || 0),
			x: (_w.pageXOffset || d._fixIeBiDiScrollLeft(de.scrollLeft) || _b.scrollLeft || 0)
		};
	};
	
	dojo._isBodyLtr = function(){
		//FIXME: could check html and body tags directly instead of computed style?  need to ignore case, accept empty values
		return !("_bodyLtr" in d) ? 
			d._bodyLtr = gcs(d.body()).direction == "ltr" :
			d._bodyLtr; // Boolean 
	}
	
	dojo._getIeDocumentElementOffset = function(){
		// summary
		// The following values in IE contain an offset:
		//     event.clientX 
		//     event.clientY 
		//     node.getBoundingClientRect().left
		//     node.getBoundingClientRect().top
		// But other position related values do not contain this offset, such as
		// node.offsetLeft, node.offsetTop, node.style.left and node.style.top.
		// The offset is always (2, 2) in LTR direction. When the body is in RTL
		// direction, the offset counts the width of left scroll bar's width.
		// This function computes the actual offset.

		//NOTE: assumes we're being called in an IE browser

		var de = d.doc.documentElement;
		//FIXME: use this instead?			var de = d.compatMode == "BackCompat" ? d.body : d.documentElement;

		return (d.isIE >= 7) ?
			{x: de.getBoundingClientRect().left, y: de.getBoundingClientRect().top}
		:
			// IE 6.0
			{x: d._isBodyLtr() || window.parent == window ?
				de.clientLeft : de.offsetWidth - de.clientWidth - de.clientLeft, 
				y: de.clientTop}; // Object
	};
	
	dojo._fixIeBiDiScrollLeft = function(/*Integer*/ scrollLeft){
		// In RTL direction, scrollLeft should be a negative value, but IE 
		// returns a positive one. All codes using documentElement.scrollLeft
		// must call this function to fix this error, otherwise the position
		// will offset to right when there is a horizontal scrollbar.
		var dd = d.doc;
		if(d.isIE && !dojo._isBodyLtr()){
			var de = dd.compatMode == "BackCompat" ? dd.body : dd.documentElement;
			return scrollLeft + de.clientWidth - de.scrollWidth; // Integer
		}
		return scrollLeft; // Integer
	}

	dojo._abs = function(/*DomNode*/node, /*Boolean?*/includeScroll){
		//	summary:
		//		Gets the position of the passed element relative to
		//		the viewport (if includeScroll==false), or relative to the
		//		document root (if includeScroll==true).
		//
		//		Returns an object of the form:
		//			{ x: 100, y: 300 }
		//		if includeScroll is passed, the x and y values will include any
		//		document offsets that may affect the position relative to the
		//		viewport.

		// FIXME: need to decide in the brave-new-world if we're going to be
		// margin-box or border-box.
		var ownerDocument = node.ownerDocument;
		var ret = {
			x: 0,
			y: 0
		};

		// targetBoxType == "border-box"
		var db = d.body();
		if(d.isIE || (d.isFF >= 3)){
			var client = node.getBoundingClientRect();
			var cs;
			if(d.isFF){
				// in FF3 you have to subract the document element margins
				var dv = node.ownerDocument.defaultView;
				cs=dv.getComputedStyle(db.parentNode, null);
			}
			var offset = (d.isIE) ? d._getIeDocumentElementOffset() : { x: px(db.parentNode,cs.marginLeft), y: px(db.parentNode,cs.marginTop)};
			ret.x = client.left - offset.x;
			ret.y = client.top - offset.y;
		}else{
			if(node["offsetParent"]){
				var endNode;
				// in Safari, if the node is an absolutely positioned child of
				// the body and the body has a margin the offset of the child
				// and the body contain the body's margins, so we need to end
				// at the body
				// FIXME: getting contrary results to the above in latest WebKit.
				if(d.isSafari &&
					//(node.style.getPropertyValue("position") == "absolute") &&
					(gcs(node).position == "absolute") &&
					(node.parentNode == db)){
					endNode = db;
				}else{
					endNode = db.parentNode;
				}
				// Opera seems to be double counting for some elements
				var cs=gcs(node);
				var n=node;
				if(d.isOpera&&cs.position!="absolute"){
					n=n.offsetParent;
				}
				ret.x -= _sumAncestorProperties(n, "scrollLeft");
				ret.y -= _sumAncestorProperties(n, "scrollTop");

				var curnode = node;
				do{
					var n = curnode.offsetLeft;
					//FIXME: ugly hack to workaround the submenu in 
					//popupmenu2 does not shown up correctly in opera. 
					//Someone have a better workaround?
					if(!d.isOpera || n > 0){
						ret.x += isNaN(n) ? 0 : n;
					}
					var t = curnode.offsetTop;
					ret.y += isNaN(t) ? 0 : t;
					var cs = gcs(curnode);
					if(curnode != node){
						if(d.isSafari){
							ret.x += px(curnode, cs.borderLeftWidth);
							ret.y += px(curnode, cs.borderTopWidth);
						}else if(d.isFF){
							// tried left+right with differently sized left/right borders
							// it really is 2xleft border in FF, not left+right, even in RTL!
							ret.x += 2*px(curnode,cs.borderLeftWidth);
							ret.y += 2*px(curnode,cs.borderTopWidth);
						}
					}
					// static children in a static div in FF2 are affected by the div's border as well
					// but offsetParent will skip this div!
					if(d.isFF&&cs.position=="static"){
						var parent=curnode.parentNode;
						while(parent!=curnode.offsetParent){
							var pcs=gcs(parent);
							if(pcs.position=="static"){
								ret.x += px(curnode,pcs.borderLeftWidth);
								ret.y += px(curnode,pcs.borderTopWidth);
							}
							parent=parent.parentNode;
						}
					}
					curnode = curnode.offsetParent;
				}while((curnode != endNode) && curnode);
			}else if(node.x && node.y){
				ret.x += isNaN(node.x) ? 0 : node.x;
				ret.y += isNaN(node.y) ? 0 : node.y;
			}
		}
		// account for document scrolling
		// if offsetParent is used, ret value already includes scroll position
		// so we may have to actually remove that value if !includeScroll
		if(includeScroll){
			var scroll = d._docScroll();
			ret.y += scroll.y;
			ret.x += scroll.x;
		}

		return ret; // object
	}

	// FIXME: need a setter for coords or a moveTo!!
	dojo.coords = function(/*DomNode|String*/node, /*Boolean?*/includeScroll){
		//	summary:
		//		Returns an object that measures margin box width/height and
		//		absolute positioning data from dojo._abs().
		//
		//	description:
		//		Returns an object that measures margin box width/height and
		//		absolute positioning data from dojo._abs().
		//		Return value will be in the form:
		//			`{ l: 50, t: 200, w: 300: h: 150, x: 100, y: 300 }`
		//		Does not act as a setter. If includeScroll is passed, the x and
		//		y params are affected as one would expect in dojo._abs().
		var n=d.byId(node), s=gcs(n), mb=d._getMarginBox(n, s);
		var abs = d._abs(n, includeScroll);
		mb.x = abs.x;
		mb.y = abs.y;
		return mb;
	}

	// =============================
	// Element attribute Functions
	// =============================

	var ieLT8 = d.isIE < 8;

	var _fixAttrName = function(/*String*/name){
		switch(name.toLowerCase()){
			case "tabindex":
				// Internet Explorer will only set or remove tabindex
				// if it is spelled "tabIndex"
				// console.debug((dojo.isIE && dojo.isIE < 8)? "tabIndex" : "tabindex");
				return ieLT8 ? "tabIndex" : "tabindex";
			case "for": case "htmlfor":
				// to pick up for attrib set in markup via getAttribute() IE<8 uses "htmlFor" and others use "for"
				// get/setAttribute works in all as long use same value for both get/set
				return ieLT8 ? "htmlFor" : "for";
			case "class" :
				return d.isIE ? "className" : "class";
			default:
				return name;
		}
	}

	// non-deprecated HTML4 attributes with default values
	// http://www.w3.org/TR/html401/index/attributes.html
	// FF and Safari will return the default values if you
	// access the attributes via a property but not
	// via getAttribute()
	var _attrProps = {
		colspan: "colSpan",
		enctype: "enctype",
		frameborder: "frameborder",
		method: "method",
		rowspan: "rowSpan",
		scrolling: "scrolling",
		shape: "shape",
		span: "span",
		type: "type",
		valuetype: "valueType"
	}

	dojo.hasAttr = function(/*DomNode|String*/node, /*String*/name){
		//	summary:
		//		Returns true if the requested attribute is specified on the
		//		given element, and false otherwise.
		//	node:
		//		id or reference to the element to check
		//	name:
		//		the name of the attribute
		//	returns:
		//		true if the requested attribute is specified on the
		//		given element, and false otherwise
		node = d.byId(node);
		var fixName = _fixAttrName(name);
		fixName = fixName == "htmlFor" ? "for" : fixName; //IE<8 uses htmlFor except in this case
		var attr = node.getAttributeNode && node.getAttributeNode(fixName);
		return attr ? attr.specified : false; // Boolean
	}

	var _evtHdlrMap = {
		
	}

	var _ctr = 0;
	var _attrId = dojo._scopeName + "attrid";

	dojo.attr = function(/*DomNode|String*/node, /*String|Object*/name, /*String?*/value){
		//	summary:
		//		Gets or sets an attribute on an HTML element.
		//	description:
		//		Handles normalized getting and setting of attributes on DOM
		//		Nodes. If 2 arguments are passed, and a the second argumnt is a
		//		string, acts as a getter.
		//	
		//		If a third argument is passed, or if the second argumnt is a
		//		map of attributes, acts as a setter.
		//
		//		When passing functions as values, note that they will not be
		//		directly assigned to slots on the node, but rather the default
		//		behavior will be removed and the new behavior will be added
		//		using `dojo.connect()`, meaning that event handler properties
		//		will be normalized and that some caveats with regards to
		//		non-standard behaviors for onsubmit apply. Namely that you
		//		should cancel form submission using `dojo.stopEvent()` on the
		//		passed event object instead of returning a boolean value from
		//		the handler itself.
		//	node:
		//		id or reference to the element to get or set the attribute on
		//	name:
		//		the name of the attribute to get or set.
		//	value:
		//		The value to set for the attribute
		//	returns:
		//		when used as a getter, the value of the requested attribute
		//		or null if that attribute does not have a specified or
		//		default value;
		//
		//		when user as a setter, undefined
		//
		//	example:
		//	|	// get the current value of the "foo" attribute on a node
		//	|	dojo.attr(dojo.byId("nodeId"), "foo");
		//	|	// or we can just pass the id:
		//	|	dojo.attr("nodeId", "foo");
		//
		//	example:
		//	|	// use attr() to set the tab index
		//	|	dojo.attr("nodeId", "tabindex", 3);
		//	|
		//
		//	example:
		//	|	// set multiple values at once, including event handlers:
		//	|	dojo.attr("formId", {
		//	|		"foo": "bar",
		//	|		"tabindex": -1,
		//	|		"method": "POST",
		//	|		"onsubmit": function(e){
		//	|			// stop submitting the form. Note that the IE behavior
		//	|			// of returning true or false will have no effect here
		//	|			// since our handler is connect()ed to the built-in
		//	|			// onsubmit behavior and so we need to use
		//	|			// dojo.stopEvent() to ensure that the submission
		//	|			// doesn't proceed.
		//	|			dojo.stopEvent(e);
		//	|
		//	|			// submit the form with Ajax
		//	|			dojo.xhrPost({ form: "formId" });
		//	|		}
		//	|	});

		var args = arguments.length;
		if(args == 2 && !d.isString(name)){
			for(var x in name){ d.attr(node, x, name[x]); }
			return;
		}
		node = d.byId(node);
		name = _fixAttrName(name);
		if(args == 3){
			// FIXME:
			//		what about when the name is "style" and value is an object?
			//		It seems natural to pass it in to dojo.style(node,
			//		value)...should we support this?
			if(d.isFunction(value)){
				// clobber if we can
				var attrId = d.attr(node, _attrId);
				if(!attrId){
					attrId = _ctr++;
					d.attr(node, _attrId, attrId);
				}
				if(!_evtHdlrMap[attrId]){
					_evtHdlrMap[attrId] = {};
				}
				var h = _evtHdlrMap[attrId][name];
				if(h){
					d.disconnect(h);
				}else{
					try{
						delete node[name];
					}catch(e){}
				}

				// ensure that event objects are normalized, etc.
				_evtHdlrMap[attrId][name] = d.connect(node, name, value);

			}else if(
				(typeof value == "boolean")|| // e.g. onsubmit, disabled
				(name == "innerHTML")
			){
				node[name] = value;
			}else if((name == "style")&&(!d.isString(value))){
				d.style(node, value);
			}else{
				node.setAttribute(name, value);
			}
			return;
		}else{
			// should we access this attribute via a property or
			// via getAttribute()?
			var prop = _attrProps[name.toLowerCase()];
			if(prop){
				return node[prop];
			}else{
				var attrValue = node[name];
				return (typeof attrValue == 'boolean' || typeof attrValue == 'function') ? attrValue
					: (d.hasAttr(node, name) ? node.getAttribute(name) : null);
			}
		}
	}

	dojo.removeAttr = function(/*DomNode|String*/node, /*String*/name){
		//	summary:
		//		Removes an attribute from an HTML element.
		//	node:
		//		id or reference to the element to remove the attribute from
		//	name:
		//		the name of the attribute to remove
		d.byId(node).removeAttribute(_fixAttrName(name));
	}

	/*
	dojo.createElement = function(type, attrs, parent, position){
		// TODO: need to finish this!
	}
	*/

	// =============================
	// (CSS) Class Functions
	// =============================
	var _className = "className";

	dojo.hasClass = function(/*DomNode|String*/node, /*String*/classStr){
		//	summary:
		//		Returns whether or not the specified classes are a portion of the
		//		class list currently applied to the node. 
		return ((" "+ d.byId(node)[_className] +" ").indexOf(" "+ classStr +" ") >= 0);  // Boolean
	};

	dojo.addClass = function(/*DomNode|String*/node, /*String*/classStr){
		//	summary:
		//		Adds the specified classes to the end of the class list on the
		//		passed node.
		node = d.byId(node);
		var cls = node[_className];
		if((" "+ cls +" ").indexOf(" " + classStr + " ") < 0){
			node[_className] = cls + (cls ? ' ' : '') + classStr;
		}
	};

	dojo.removeClass = function(/*DomNode|String*/node, /*String*/classStr){
		// summary: Removes the specified classes from node.
		node = d.byId(node);
		var t = d.trim((" " + node[_className] + " ").replace(" " + classStr + " ", " "));
		if(node[_className] != t){ node[_className] = t; }
	};

	dojo.toggleClass = function(/*DomNode|String*/node, /*String*/classStr, /*Boolean?*/condition){
		//	summary: 	
		//		Adds a class to node if not present, or removes if present.
		//		Pass a boolean condition if you want to explicitly add or remove.
		//	condition:
		//		If passed, true means to add the class, false means to remove.
		if(condition === undefined){
			condition = !d.hasClass(node, classStr);
		}
		d[condition ? "addClass" : "removeClass"](node, classStr);
	};

})();