var doRollovers = function(elements) {
	elements.each(function(thisel) {
		var src = thisel.getProperty('src');
		src = src.replace('_down', '');
		var extension = src.substring(src.lastIndexOf('.'), src.length);
		thisel.getParent().getParent().setStyle('background','url('+src.replace(extension,'_down' + extension)+') no-repeat');
		thisel.addEvent('mouseenter', function() { this.fade(0); });
		thisel.addEvent('mouseleave', function() { this.fade(1); });
	});
};

window.addEvent('domready', function() {
	doRollovers($$('.rollover'));
});