window.attachEvent('onload', initMainMenu);
function initMainMenu(){ initMenu('main-menu-ul'); }

window.attachEvent('onload', initNavMenu);
function initNavMenu(){ initMenu('nav-menu-ul'); }

function initMenu(menuId)
{
	if (document.all && document.getElementById) 
	{
		root = document.getElementById(menuId);
		
		for (i=0; i < root.childNodes.length; i++) 
		{
			node = root.childNodes[i];
			
			if ((node.nodeName == "LI") && (node.childNodes.length > 2))
			{			
				node.onmouseover=
				    function() { 
				        this.className += " mouseover"; this.childNodes[0].className += " mouseover"; this.cancelBubble = true;
				    };
				    
				node.onmouseout=
				    function() { 
				        this.className = this.className.replace(" mouseover", ""); this.childNodes[0].className = this.childNodes[0].className.replace(" mouseover", ""); this.cancelBubble = true;
				    };
			}
		}
	}
}