function showSubNav(whichSubNav) {
	if(document.getElementById)
		document.getElementById(whichSubNav).style.visibility="visible";
	else return;
}
function hideSubNav() {
	if(document.getElementById) {
		document.getElementById("subNavTwo").style.visibility="hidden";
		document.getElementById("subNavSeven").style.visibility="hidden";
	}
	else return;
}