/* 画像先読み */
	if(document.img){
		var imgCh=new Array();
			imgCh[0] = new Image(),imgCh[0].src="img/event_btn_on.gif";
			imgCh[1] = new Image(),imgCh[1].src="img/event_btn_off.gif";
			imgCh[2] = new Image(),imgCh[2].src="img/coupon_btn_on.gif";
			imgCh[3] = new Image(),imgCh[3].src="img/coupon_btn_off.gif";
			imgCh[4] = new Image(),imgCh[4].src="img/floor_btn_on.gif";
			imgCh[5] = new Image(),imgCh[5].src="img/floor_btn_off.gif";
			imgCh[6] = new Image(),imgCh[6].src="img/access_btn_on.gif";
			imgCh[7] = new Image(),imgCh[7].src="img/access_btn_off.gif";
			imgCh[8] = new Image(),imgCh[8].src="img/inquiry_btn_on.gif";
			imgCh[9] = new Image(),imgCh[9].src="img/inquiry_btn_off.gif";
	}
/* マウスオーバーボタン */
	function chBttn(name,num){
		if(document.img)document.img[name].src = imgCh[num].src;
	}