/**
 * @author knakayam
 */
(function(){
	if (Event) {
		Event.observe(window, 'load', function(){
			$$(".ov").each(function(e){
				var ftype = e.src.substring(e.src.lastIndexOf('.'), e.src.length);
				var hsrc = e.src.replace(ftype, '_on' + ftype);
				var imgOff = e;
				var imgOn = new Element('img', {
					src: hsrc,
					style: 'display: none;',
					border: '0'
				});
				Event.observe(imgOn, 'mouseout', function(){
					imgOn.hide();
					imgOff.show();
				});
				Event.observe(imgOff, 'mouseover', function(){
					imgOn.show();
					imgOff.hide();
				});
				Event.observe(imgOn, 'click', function(){
					imgOn.hide();
					imgOff.show();
				});
				new Insertion.After(e, imgOn);
			});
		});
	}
})();