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

			$$('img.mo').each(function(img) {  
		    	var src = img.getProperty('src');  
			    var extension = src.substring(src.lastIndexOf('.'),src.length)  
		    	img.addEvent('mouseenter', function() { img.setProperty('src',src.replace(extension,'-mo' + extension));});  
			    img.addEvent('mouseleave', function() { img.setProperty('src',src); });  
			});  
					
	});