var prevBkgColor;
activateMenu = function(nav)
{
    /* currentStyle restricts the Javascript to IE only */
	if (document.all && document.getElementById(nav).currentStyle)
	{  
        var navroot = document.getElementById(nav);
        
        /* Get all the list items within the menu */
        var lis=navroot.getElementsByTagName("LI");  
        for (i=0; i<lis.length; i++)
		{        
           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL")
			{           
                /* assign the function to the LI */
             	lis[i].onmouseover=function()
				{	
                   /* display the inner menu */
                   this.lastChild.style.display="block";
				   prevBkgColor = this.style.backgroundColor;
				   this.style.backgroundColor ="#CCCCCC";
       			}
                lis[i].onmouseout=function()
				{                       
                   this.lastChild.style.display="none";
				   this.style.backgroundColor = prevBkgColor;
                }
           }
        }
    }
}