function simpleRollOver(idName) {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");
		for(var i=0; i < images.length; i++){
			if(images[i].getAttribute("src").match("label_mmenu|label_smenu")) {
				fileName = new Array(images[i].getAttribute("src").replace(".png", "_r.png"));
				preImages = new Array();
				for (j=0; j<fileName.length; j++){
					preImages[j] = new Image();
					preImages[j].src = fileName[j]; // 画像をプリロード
				}
				if(images[i].parentNode.parentNode.className != "current") {
					images[i].onmouseover = function() {
						this.setAttribute("src", this.getAttribute("src").replace(".png", "_r.png"));
					}
					images[i].onmouseout = function() {
						this.setAttribute("src", this.getAttribute("src").replace("_r.png", ".png"));
					}
				}else{
					images[i].setAttribute("src", images[i].getAttribute("src").replace(".png", "_r.png"));
				}
			}
		}
	}
}

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