gistfile1.txt

$(document).ready(function(){
  // Cache the Window object
	$window = $(window);
                
   $('div[data-type="background"]').each(function(){
     var $bgobj = $(this); // assigning the object
                    
      $(window).scroll(function() {
                    
		// Scroll the background at var speed
		// the yPos is a negative value because we're scrolling it UP!

    var yStart = $(window).height() * 0.2;

		var yPos = -(($window.scrollTop() - yStart) / $bgobj.data('speed')); 
		
		// Put together our final background position
		var coords = '50% '+ yPos + 'px';

		// Move the background
		$bgobj.css({ backgroundPosition: coords });
		
}); // window scroll Ends

 });	

}); 

/* 
 * Create HTML5 elements for IE's sake
 */

document.createElement("article");
document.createElement("section");