// JavaScript Document
//スワップイメージ


function doSwap(){
	//クラス名
	var objectClassName="rollover";
	
	//ファイル名
	var objectFileName="_f2";
	
	
	var images = document.getElementsByTagName("img");
	var preloadimg=new Array();
	
	for(var i=0; i<images.length; i++){
		if(images[i].className.match(objectClassName)){
			
			dot_b=images[i].src.lastIndexOf('.');		
			overimg=images[i].src.substr(0,dot_b) + objectFileName + images[i].src.substr(dot_b,5);
			preloadimg[i]=new Image();
			preloadimg[i].src=overimg;
			
			images[i].onmouseover=function(){
				var dot=this.src.lastIndexOf('.');
				var imgSrc_on=this.src.substr(0,dot) + objectFileName + this.src.substr(dot,5);
				this.src=imgSrc_on;
			}
			images[i].onmouseout=function(){
				this.setAttribute("src",this.getAttribute("src").replace(objectFileName,""));
			}
		}
	}
}

Event.observe(window,"load",doSwap,false);