var n1 = "false";
	home       = new Image();
	home.src   = "images/home.gif";
	homeon     = new Image();
	homeon.src = "images/over_home.gif";

	var n1 = "false";
	contact       = new Image();
	contact.src   = "images/contact.gif";
	contacton     = new Image();
	contacton.src = "images/over_contact.gif";
	
	var n1 = "false";
	map       = new Image();
	map.src   = "images/sitemap.gif";
	mapon     = new Image();
	mapon.src = "images/over_sitemap.gif";

	
function on1(name)
	{
   		 document[name].src = eval(name + "on.src");
	}

	function off1(name)
	{
   		 document[name].src = eval(name + ".src");
	}

	n1 = true;
		function on(name)
	{
   		if (n1)
      		on1(name);
	}

		function off(name)
	{
   		if (n1)
      		off1(name);
}