if (document.images) {           
	menu1on = new Image();
	menu1on.src = "images/b01_home_on.gif";
	menu1off = new Image();
	menu1off.src = "images/b01_home.gif";

	menu2on = new Image();
	menu2on.src = "images/b03_serv_on.gif";
	menu2off = new Image();
	menu2off.src = "images/b03_serv.gif";

	menu3on = new Image();
	menu3on.src = "images/b02_pro_on.gif";
	menu3off = new Image();
	menu3off.src = "images/b02_pro.gif";

	menu4on = new Image();
	menu4on.src = "images/b04_trans_on.gif";
	menu4off = new Image();
	menu4off.src = "images/b04_trans.gif";

	menu5on = new Image();
	menu5on.src = "images/b05_news_on.gif";
	menu5off = new Image();
	menu5off.src = "images/b05_news.gif";

	menu6on = new Image();
	menu6on.src = "images/b06_contact_on.gif";
	menu6off = new Image();
	menu6off.src = "images/b06_contact.gif";
}