$(document).ready(function(){
    // cache the window object
    $window = $(window);

    $('section[data-type="background"]').each(function(){
        // declare the variable to affect the defined data-type
        var $scroll = $(this);

        $(window).scroll(function() {
            // HTML5 proves useful for helping with creating JS functions!
            // also, negative value because we're scrolling upwards
            var yPos = -($window.scrollTop() / $scroll.data('speed'));

            // background position
            var coords = '50% '+ yPos + 'px';

            // move the background
            $scroll.css({ backgroundPosition: coords });
        }); // end window scroll
    });  // end section function
}); // close out script

/* Create HTML5 element for IE */
document.createElement("section");