// store the browser
	var is_ie = true;
	var appv = 4;
	
	// determine the browser when the page opens
	function getBrowser() {
		
		appv = parseFloat(navigator.appVersion);
		
		var browser_make = navigator.appName.toLowerCase();
		
		if (browser_make.indexOf('microsoft') != -1) { is_ie = true; }
		else { is_ie = false; }
		
		if ((!is_ie) && (appv < 5)) { alert("This script is not operational in Netscape 4 and under."); }
		
	}
	
	// a menu item has been clicked
	function flipit(n) {
	
		// ie browser	
		if (is_ie) {
			// hide all the others
			for (var i = 1; i < 5; i++) {
				eval("document.all['menu" + i + "'].style.visibility = 'hidden'");
			}
			// display menu
			eval("document.all['menu" + n + "'].style.visibility = 'visible'");
		
		// netscape browser	
		} else {
			
			// hide welcome
			getObj("home").visibility = 'hidden';
			
			// hide all the others
			for (var i = 1; i < 3; i++) {
				getObj("menu" + i + "").visibility = 'hidden';
			}
			// display menu
			getObj("menu" + n + "").visibility = 'visible';
			
		}
	}
		
	// return an object in Netscape 6
	function getObj(name) {
	
		if (document.getElementById) {
		
			return document.getElementById(name).style;
			
		}
	}