var img = new Array();
	img[0] = new Image();  img[0].src = "img/bot_cor_on.gif";
	img[1] = new Image();  img[1].src = "img/bot_set_on.gif";
	img[2] = new Image();  img[2].src = "img/bot_tok_on.gif";
	img[3] = new Image();  img[3].src = "img/bot_ais_on.gif";
			
//リンク関数
	function overevent(n){
		document.images["bot_" + n].src="img/bot_" + n + "_on.gif";
	}
	function outevent(n){
		document.images["bot_" + n].src="img/bot_" + n + "_of.gif";
	}