window.onload = function () {
	var navs = document.getElementById('nav').getElementsByTagName('li');
	for(key in navs) {
		navs[key].onmouseover = ShowIcon;
	}
	if (document.getElementById('content')) {
		document.getElementById('content').onmouseover = HideIcon;
		document.getElementById('sidebar').onmouseover = HideIcon;
	} else {
		document.getElementById('quote').onmouseover = HideIcon;
	}
}
var MenuNode;
function ShowIcon() {
	HideIcon();
	this.firstChild.style.display = 'block';
	MenuNode = this;
}
function HideIcon() {
	if (MenuNode) {
		MenuNode.firstChild.style.display = 'none';
	}
	MenuNode = null;
}