// ロールオーバー
$(function() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");
		var images_pre = new Array();
		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("_off.")) {
				images_pre[i] = new Image();
				images_pre[i].src = images[i].getAttribute("src").replace("_off.", "_on.")

				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."));
				}
			}
		}
	}
});