function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages=new Array()
	
	var aTags=['img','input']
	for(var a=0;a<aTags.length;a++){
		aImages = document.getElementsByTagName(aTags[a]);
		for (var i = 0; i < aImages.length; i++) {		
			if (aImages[i].className == 'imgover') {
				var src = aImages[i].getAttribute('src');
				var ftype = src.substring(src.lastIndexOf('.'), src.length);
				var hsrc = src.replace(ftype, '_on'+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('_on'+ftype, ftype);
					this.setAttribute('src', sTempSrc);
				}
			}
		}
	}
}


//他のライブラリとバッティングを回避
try{
	window.addEventListener("load",initRollovers,false);
}catch(e){
	window.attachEvent("onload",initRollovers);
}