function setMenu() {
	
		// Set left position for menu by dividing screen
		// in half, subtracting half the width of the main table (400)
		// and adding back in 20 for spacing on the left.
		if (navigator.appName == "Microsoft Internet Explorer") {
			var leftPos = (document.body.clientWidth / 2) - 390;
		} else {
			var leftPos = (window.innerWidth / 2) - 380;
		}
		
		if (leftPos < 10) {
			leftPos = 10;
		}
		
		document.getElementById("menu_div").style.top = "240px";
		document.getElementById("menu_div").style.left = leftPos;
		document.getElementById("menu_div").style.visibility = "visible";
	
	}