var mySubList=new Array();
mySubList[0] = 2;
			mySubList[1] = 7;
			function HideNav()
{
	for( i=0; i < 2; i++ )
	document.getElementById(mySubList[i]).style.visibility = "hidden";
}
function ShowNav(NavID)
{
	HideNav();
	document.getElementById(NavID).style.visibility = "visible";
}