// roll over function for nav buttons
	function navRollOver(myRef) {
		myRef.src = eval(myRef.name + "_over").src;
	}
	
	// roll out function for nav buttons
	function navRollOut(myRef) {
		myRef.src = "images/" + myRef.name + ".gif";
	}
	
	// open help page
	function openHelp() {
		openHelp.helpRef = window.open('help.htm','help','width=450,height=250');
	}
	openHelp.helpRef;