(function(onLoad) {
		try {
				window.addEventListener('load', onLoad, false);
		} catch (e) {
				window.attachEvent('onload', onLoad);
		}
})(function() {
	var tags = ["img","input"];
	for( var i=0, len=tags.length; i<len; i++ ) {
		var over = function() { this.src = this.src.replace('_off.', '_on.'); };
		var out	= function() { this.src = this.src.replace('_on.', '_off.'); };
		var el = document.getElementsByTagName(tags[i]);
		for (var j=0, len2=el.length; j<len2; j++) {
			var attr = el[j].getAttribute('src');
			if(!el[j].src.match(/_off\./)&&attr) {
				var fileName = function() { this.src = this.src.replace('_off.', '_on.'); };
				var preImages = new Array();
				for (k=0; k<fileName.length; j++) {
					preImages[k] = new Image();
					preImages[k].src = fileName[j]; //「_on」の画像をプリロード
				}
			}			
			if (!el[j].src.match(/_off\./)&&attr) continue;
			el[j].onmouseover = over;
			el[j].onmouseout	= out;
		}
	}
});