function imgMouseOverEvents(outString, overString, selector) {
	$$(selector).each(function(image) {
		image = $(image);
		if (image.src) {
			if (image.src.indexOf(outString) > 0) {
				image.observe('mouseover',function(){
					image.src = image.src.replace(outString, overString);
				}).observe('mouseout', function(){ 
					image.src = image.src.replace(overString, outString);
				});
			}
		}
	});
};
FastInit.addOnLoad(function(){imgMouseOverEvents('_off', '_on', 'img.autoMouseOver');});