browser_name = navigator.appName;
		browser_version = parseFloat(navigator.appVersion); 

		if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; }
		else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 4.0) { roll = 'true'; }
		else { roll = 'false'; }

		if (roll == 'true') {

		var imglist = new Array (
		"images/nav_who_hot.gif",
		"images/nav_who.gif",
		"images/nav_model.gif",
		"images/nav_model_hot.gif",
		"images/nav_programs.gif",
		"images/nav_programs_hot.gif",
		"images/nav_services.gif",
		"images/nav_services_hot.gif",
		"images/nav_help.gif",
		"images/nav_help_hot.gif",
		"images/nav_contact.gif",
		"images/nav_contact_hot.gif",
		"images/nav_map.gif",
		"images/nav_map_hot.gif",
		"images/nav_resources.gif",
		"images/nav_resources_hot.gif"

		);
		var imgs = new Array();

		var count;
		if (document.images)
		 for (count=0; count<imglist.length; count++)
		  {imgs[count]=new Image(); imgs[count].src=imglist[count];}
		}

		     function msover(img,ref) { if (roll == 'true') { document.images[img].src = ref; } }
		     function msout(img,ref)  { if (roll == 'true') { document.images[img].src = ref; } }