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

	var images = [];
	
	$$('img.roll').each(function(img) {
		var src = img.getProperty('src');
		var extension = src.substring(src.lastIndexOf('.'),src.length)
		var srch = src.replace(extension,'-on' + extension);
		images.include(srch);
		img.addEvent('mouseenter', function() { img.setProperty('src',srch); });
		img.addEvent('mouseleave', function() { img.setProperty('src',src); });
	});
	
	var loader = new Asset.images(images);

});