function changeOpacity() {
	var a_link = this;
	var x = parseFloat(this.style.opacity);
	var y = Math.floor(x*100);
	a_link.clear = setInterval(function() {
		if (x < 1.0) {
			x+=.1;
			x = parseFloat(x.toFixed(1));
			y = Math.floor(x*100);
			a_link.style.opacity = x;
			a_link.style.filter = "alpha(opacity=" + y + ")";
			
		} else {
			clearInterval(a_link.clear);
		}
	}, 50);
}

function resetOpacity() {
	clearInterval(this.clear);
	this.style.opacity = 0;
	this.style.filter = "alpha(opacity=0)";
}

function prepareOpacity() {
	if (!document.getElementById ||
		!document.getElementById('navMenu')) return false;
	var navMenu = document.getElementById('navMenu');
	var links = navMenu.getElementsByTagName('a');
	for (var i = 0; i < links.length; i++) {
		links[i].style.opacity = 0;
		links[i].style.filter = "alpha(opacity=0)";
		links[i].onmouseover = changeOpacity;
		links[i].onmouseout = resetOpacity;
	}
}

addLoadEvent(prepareOpacity);