function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");

		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("_off."))
			{
				images[i].onmouseover = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
				}
				images[i].onmouseout = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
				}
			}
		}
	}
}

/*Original*/
function preload(imgs){
 for(var i = 0; i < imgs.length; i++){
   var imgObj = new Image();
   imgObj.src = imgs[i];
 }
}
preload(["http://static.loda.jp/home/img/col2_sample_on.gif", "http://static.loda.jp/home/img/col2_rental_on.gif", "http://static.loda.jp/home/img/col4_gl_agree_active_on.gif", "http://static.loda.jp/home/img/col4_gl_agree_on.gif", "http://static.loda.jp/home/img/col4_gl_faq_active_on.gif", "http://static.loda.jp/home/img/col4_gl_faq_on.gif", "http://static.loda.jp/home/img/col4_gl_home_active_on.gif", "http://static.loda.jp/home/img/col4_gl_home_on.gif", "http://static.loda.jp/home/img/col4_gl_mail_active_on.gif", "http://static.loda.jp/home/img/col4_gl_mail_on.gif", "http://static.loda.jp/home/img/col4_gl_rental_active_on.gif", "http://static.loda.jp/home/img/col4_gl_rental_on.gif", "http://static.loda.jp/home/img/col4_gl_sample_on.gif", "http://static.loda.jp/home/img/col4_sample_on.gif", "http://static.loda.jp/home/img/col4_rental_on.gif", "http://static.loda.jp/home/img/unitip/clear.gif", "http://static.loda.jp/home/img/unitip/TipCap.png", "http://static.loda.jp/home/img/unitip/TipMid.png", "http://static.loda.jp/home/img/unitip/TipPoint.png"]);

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