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."));
				}
			}
		}
	}
}


//トップページリンク
function top_roll(on_id){
	var f = 'img/';
	var imageNum = "";
	var targ = ""
	var mt_url = "";
	
	//グローバル
	if (on_id == 'top_01'){
		imageNum = 'btn_t_01';
		targ = 'btn_01';
		my_url = 'enjoylife/index.html#h02';
	}
	//フレンドシップ
	if (on_id == 'top_02'){
		imageNum = 'btn_t_02';
		targ = 'btn_02';
		my_url = 'enjoylife/index.html';
	}
	//光と緑
	if (on_id == 'top_03'){
		imageNum = 'btn_t_03';
		targ = 'btn_03';
		my_url = 'facilities/index.html';
	}
	//向上心アップ
	if (on_id == 'top_04'){
		imageNum = 'btn_t_04';
		targ = 'btn_04';
		my_url = 'facilities/index.html';
	}
	if (document.images) document.getElementById(targ).src = f + imageNum + '_on.jpg';
	
	//クリック・マウスアウトイベント
	document.getElementById(on_id).onclick = function() {
		location.href = my_url;
	}
	document.getElementById(on_id).onmouseout = function(){
		document.getElementById(targ).src = f + imageNum + '_off.jpg';
	}
}


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