function initRollovers() {
if (!document.getElementById) return

var aPreLoad = new Array();
var sTempSrc;
var aImages = document.getElementsByTagName('img');

for (var i = 0; i < aImages.length; i++) { 
if (aImages[i].className == 'img-hover') {
var src = aImages[i].getAttribute('src');
var ftype = src.substring(src.lastIndexOf('.'), src.length);
var hsrc = src.replace(ftype, '_hover'+ftype);

aImages[i].setAttribute('hsrc', hsrc);

aPreLoad[i] = new Image();
aPreLoad[i].src = hsrc;

aImages[i].onmouseover = function() {
sTempSrc = this.getAttribute('src');
this.setAttribute('src', this.getAttribute('hsrc'));
} 

aImages[i].onmouseout = function() {
if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_hover'+ftype, ftype);
this.setAttribute('src', sTempSrc);
}
}
}
}

/*バッティング回避*/
function addEvent(elm,listener,fn){
	try{
		elm.addEventListener(listener,fn,false);
	}catch(e){
		elm.attachEvent("on"+listener,fn);
	}
}
/*実行*/
addEvent(window,"load",initRollovers);

//ie画像再読み込み防止
try {
	document.execCommand("BackgroundImageCache", false, true);
} catch(e) {}