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        //zooming the Treemap in and out
        addLeftClickHandler: true,
        addRightClickHandler: true,
        
        //When hovering a node highlight the nodes
        //between the root node and the hovered node. This
        //is done by adding the 'in-path' CSS class to each node.
        selectPathOnHover: true,
                
        Color: {
            //Allow coloring
            allow: true,
            //Set min value and max value constraints
            //for the *$color* property value.
            //Default's to -100 and 100.
            minValue: 1,
            maxValue: 50,
            //Set color range. Default's to reddish and greenish.
            //It takes an array of three
            //integers as R, G and B values.
            minColorValue: [0, 255, 50],
            maxColorValue: [255, 0, 50]
        },
        
        //Allow tips
        Tips: {
          allow: true,
          //add positioning offsets
          offsetX: 20,
          offsetY: 20,
          //implement the onShow method to
          //add content to the tooltip when a node
          //is hovered
          onShow: function(tip, node, isLeaf, domElement) {
              tip.innerHTML = "<div class=\"tip-title\">" + node.name + "</div>" + 
                "<div class=\"tip-text\">" + this.makeHTMLFromData(node.data) + "</div>"; 
          },  

          //Build the tooltip inner html by taking each node data property
          makeHTMLFromData: function(data){
              var html = '';
              html += "playcount" + ': ' + data.$area + '<br />';
              if ("$color" in data) 
                  html += "rank" + ': ' + data.$color + '<br />';
              if ("image" in data) 
                  html += "<img class=\"album\" src=\"" + data.image + "\" />";
              return html;
          }
        },

        //Remove all element events before destroying it.
        onDestroyElement: function(content, tree, isLeaf, leaf){
            if(leaf.clearAttributes) leaf.clearAttributes();
        }
    });
    
    //load JSON and plot
    tm.loadJSON(json);
    //end

    document.getElementById('out_button').onclick = function(){
        tm.out();
    };
    
}