function closeMenus(){
	var tname
	if (event.srcElement) {
		tname=event.srcElement.className;
	} else if (event.target) {
		tname=event.target.className;
	}
	if (tname != "menuClass") {
		document.getElementById('menu1').style.visibility="hidden";
		document.getElementById('menu2').style.visibility="hidden";
		document.getElementById('menu3').style.visibility="hidden";
		document.getElementById('menu4').style.visibility="hidden";
	}
}
		
function toggleMenu(menu) {
	var el = document.getElementById(menu);

	if (el.style.visibility=="hidden") {
		el.style.opacity = 0;
		el.style.visibility="visible";
		var i;
		for (i=0; i<=100; i=i+10) {
			alert(i);
			setTimeout(fadeIn(el), 500);
		}
	} else {
		el.style.visibility="hidden";
	}
}

function fadeIn(el) {
	el.style.opacity = i;
}