function chgAnnouncements() {
document.getElementById("iFrame").src="hgAnnouncements.htm"
}
function chgLinks() {
document.getElementById("iFrame").src="hgLinks.htm"
}
function chgCoffee() {
document.getElementById("iFrame").src="hgCoffee.htm"
}
function chgLibrary() {
document.getElementById("iFrame").src="hgLibrary.htm"
}