function img_ro() {
	if (!document.getElementById) return;
	var pre_img_ar = new Array();
	var ro_img = document.getElementsByTagName('img');
	for (var i=0; i<ro_img.length;i++) {
		if (ro_img[i].className == 'ro') {
			var out_src = ro_img[i].src;
			var ext = out_src.substr(out_src.length - 4,4);
			var over_src = out_src.replace(ext,'_o'+ext);
			pre_img_ar[i] = new Image();
			pre_img_ar[i].src = over_src;
			ro_img[i].setAttribute('out_src',out_src);
			ro_img[i].setAttribute('over_src',over_src);
			ro_img[i].onmouseover = function(){this.src = this.getAttribute('over_src');}	
			ro_img[i].onmouseout = function(){this.src = this.getAttribute('out_src');}
		}
	}
}
try{window.addEventListener("load",img_ro,false);}catch(e){window.attachEvent("onload",img_ro);}

///////////////////////////////////////////////////////////////////////////////////////////
//  ロールオーバースクリプト
//　Standards Compliant Rollover Script
//　Author : Daniel Nolan
//　http://www.bleedingego.co.uk/webdev.php

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 == 'imgover') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+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('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

///////////////////////////////////////////////////////////////////////////////////////////