/* 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";
			
			imgCh[10] = new Image(),imgCh[10].src="/floor/img/btn_b1f_on.gif";
			imgCh[11] = new Image(),imgCh[11].src="/floor/img/btn_b1f_off.gif";
			imgCh[12] = new Image(),imgCh[12].src="/floor/img/btn_1f_on.gif";
			imgCh[13] = new Image(),imgCh[13].src="/floor/img/btn_1f_off.gif";
			imgCh[14] = new Image(),imgCh[14].src="/floor/img/btn_2f_on.gif";
			imgCh[15] = new Image(),imgCh[15].src="/floor/img/btn_2f_off.gif";
			imgCh[16] = new Image(),imgCh[16].src="/floor/img/btn_3f_on.gif";
			imgCh[17] = new Image(),imgCh[17].src="/floor/img/btn_3f_off.gif";
			imgCh[18] = new Image(),imgCh[18].src="/floor/img/btn_4f_on.gif";
			imgCh[19] = new Image(),imgCh[19].src="/floor/img/btn_4f_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;
	}