function rollOn(strMode)
{
	switch(strMode)
	{
		case "navNews":
			document.navNews.src = strRoot + "images/newson.gif";
			break;
		case "navCalendar":
			document.navCalendar.src = strRoot + "images/calendaron.gif";
			break;
		case "navHost":
			document.navHost.src = strRoot + "images/hoston.gif";
			break;
		case "navSponsors":
			document.navSponsors.src = strRoot + "images/sponsorson.gif";
			break;
		case "navContact":
			document.navContact.src = strRoot + "images/contacton.gif";
			break;
		case "navMedia":
			document.navMedia.src = strRoot + "images/mediaon.gif";
			break;
		case "navVolunteer":
			document.navVolunteer.src = strRoot + "images/volunteeron.gif";
			break;
		case "navVisitor":
			document.navVisitor.src = strRoot + "images/visitoron.gif";
			break;
			
	}
}

function rollOff(strMode)
{
	switch(strMode)
	{
		case "navNews":
			document.navNews.src = strRoot + "images/news.gif";
			break;
		case "navCalendar":
			document.navCalendar.src = strRoot + "images/calendar.gif";
			break;
		case "navHost":
			document.navHost.src = strRoot + "images/host.gif";
			break;
		case "navSponsors":
			document.navSponsors.src = strRoot + "images/sponsors.gif";
			break;
		case "navContact":
			document.navContact.src = strRoot + "images/contact.gif";
			break;
		case "navMedia":
			document.navMedia.src = strRoot + "images/media.gif";
			break;
		case "navVolunteer":
			document.navVolunteer.src = strRoot + "images/volunteer.gif";
			break;	
		case "navVisitor":
			document.navVisitor.src = strRoot + "images/visitor.gif";
			break;																		
	}
}