window.addEvent('domready', function() {  

 $$('img.mo').each(function(img) {  
     var src = img.getProperty('src');  
     var extension = src.substring(src.lastIndexOf('.'),src.length)  
		 // Preload the image
		 new Asset.images([src.replace(extension,'-over' + extension)]);
		 
     img.addEvent('mouseenter', function() { img.setProperty('src',src.replace(extension,'-over' + extension)); });  
     img.addEvent('mouseleave', function() { img.setProperty('src',src); });  
 });  
 }); 
 /*
Array.each.delay(3,this,[
	['images/insight-over.gif', 'images/infield-over.gif','images/intel-over.gif'],
	function(src){var img = new Image();img.src = src;}
]);
*/