var initFlg = false;
<!--ロールオーバーイメージ
function initRollovers() {
	if (initFlg) return;
	initFlg = true;
	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 == 'imgover') {
			var src = aImages[i].getAttribute('src').replace(/^(.*)_over(\.(gif|jpg|jpeg|png))$/im,"$1$2");
			var hsrc = src.replace(/^(.*)(\.(gif|jpg|jpeg|png))$/im,"$1_over$2");
			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(/^(.*)_over(\.(gif|jpg|jpeg|png))$/im,"$1$2");
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

if(window.addEventListener)
{
	window.addEventListener('load', initRollovers, true);
}
else if(window.attachEvent)
{
	window.attachEvent("onload", initRollovers);
}
else
{
	window["onload"] = initRollovers;
}

//-->

<!--inputロールオーバーイメージ
function mouseImage(elem,image,type) {
	switch(type){
	case 'over':
		image=image.replace(/^(.*)_over(\.(gif|jpg|jpeg|png))$/im,"$1$2");
		elem.src=image.replace(/^(.*)(\.(gif|jpg|jpeg|png))$/im,"$1_over$2");
		break;
		
	case 'out':	
		elem.src=image.replace(/^(.*)_over(\.(gif|jpg|jpeg|png))$/im,"$1$2");
		break;
	}
}
//-->