/*プルダウンメニューと画像切り替え*/
function treeMenu(tName, imgClose, imgOpen, obj) {
	tMenu = document.getElementById(tName).style;
	if(tMenu.display == 'none'){
		tMenu.display = "block";
		obj.src = imgOpen;
	}
	else {
		tMenu.display = "none";
		obj.src = imgClose;
	}
}

/*画像のロールオーバー*/
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."));
				}
			}
		}
	}
}
if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}