/* ロールオーバー
========================================== */
function smartRollover() {

	if(document.getElementsByTagName) {
		var tags = ["img","input"];
		for( var t=0, len=tags.length; t<len; t++ ) {
			var images = document.getElementsByTagName(tags[t]);
			for(var i=0; i < images.length; i++) {
				if(tags[t] == "input"){
					if(images[i].getAttribute("type") == "image"){
						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."));
							}
						}
					}
				}else{
					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."));
						}
					}
				}
			}
		}
	}
}

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