//ロールオーバー用JavaScript
/*
v0.1
update 2008.10.27
*/
//イベントハンドラを設定
function rollOver(){
	var allimg = document.getElementsByTagName('img');
	for(i=0; i<allimg.length; i++){
		if(allimg[i].src.indexOf('_off') >= 0){
			preloadImg(allimg[i].src.replace('_off', '_on'));
			allimg[i].onmouseover = function(){
				this.setAttribute("src", this.src.replace('_off', '_on'));
			}
			allimg[i].onmouseout = function(){
				this.setAttribute("src", this.src.replace('_on', '_off'));
			}
		}
	}
}

//プリロードイメージ
function preloadImg(o){
	var i = new Image;
	i.src = o;
}


if(window.addEventListener){
	window.addEventListener("load", rollOver, false);
}else if(window.attachEvent){
	window.attachEvent("onload", rollOver);
}