if (document.images)
{
	var homeOn = new Image();
	homeOn.src = "/images/menu_home_on.gif";
	var homeOff = new Image();
	homeOff.src = "/images/menu_home.gif";

	var tourOn = new Image();
	tourOn.src = "/images/menu_tour_on.gif";
	var tourOff = new Image();
	tourOff.src = "/images/menu_tour.gif";

	var faqOn = new Image();
	faqOn.src = "/images/menu_faq_on.gif";
	var faqOff = new Image();
	faqOff.src = "/images/menu_faq.gif";

	var signupOn = new Image();
	signupOn.src = "/images/menu_signup_on.gif";
	var signupOff = new Image();
	signupOff.src = "/images/menu_signup.gif";

	var loginOn = new Image();
	loginOn.src = "/images/menu_login_on.gif";
	var loginOff = new Image();
	loginOff.src = "/images/menu_login.gif";
}

 function changeImage(id,action)
 {
 	if(document.images) document.images[id].src = eval( id + action + ".src");
    return true;
 }