var leftMenuId = "leftMenu";
var topMenuId = "topMenu";
var hoverClassName = "jshover";

addHoverHandlers = function() {
	var leftMenuItems = document.getElementById(leftMenuId).getElementsByTagName("li");
	for (var i = 0, leftMenuItemsCount = leftMenuItems.length; i < leftMenuItemsCount; i++)
	{
		leftMenuItems[i].onmouseover = function()
		{ 
			this.className += (" " + hoverClassName);
		}
		leftMenuItems[i].onmouseout = function()
		{
			this.className = this.className.replace((" " + hoverClassName), "");
		}
	}
	var topMenuItems = document.getElementById(topMenuId).getElementsByTagName("li");
	for (var i = 0, topMenuItemsCount = topMenuItems.length; i < topMenuItemsCount; i++)
	{
		topMenuItems[i].onmouseover = function()
		{ 
			this.className += ("_" + hoverClassName);
		}
		topMenuItems[i].onmouseout = function()
		{
			this.className = this.className.replace(("_" + hoverClassName), "");
		}
	}
}

if (window.attachEvent && navigator.userAgent.indexOf("Opera") == -1)
{
	window.attachEvent("onload", addHoverHandlers);
}