/* 画像先読み */
	if(document.images){
		var imgCh=new Array();
			imgCh[0] = new Image(),imgCh[0].src="../images/products_btn_off.gif";
			imgCh[1] = new Image(),imgCh[1].src="../images/products_btn_on.gif";
			imgCh[2] = new Image(),imgCh[2].src="../images/about_btn_off.gif";
			imgCh[3] = new Image(),imgCh[3].src="../images/about_btn_on.gif";
			imgCh[4] = new Image(),imgCh[4].src="../images/shop_btn_off.gif";
			imgCh[5] = new Image(),imgCh[5].src="../images/shop_btn_on.gif";
			imgCh[6] = new Image(),imgCh[6].src="../images/info_btn_off.gif";
			imgCh[7] = new Image(),imgCh[7].src="../images/info_btn_on.gif";
			
	}
/* マウスオーバーボタン */
	function chBttn(name,num){
		if(document.images)document.images[name].src = imgCh[num].src;
	}