function horizontal() 
{
	var navItems = document.getElementById("barra").getElementsByTagName("li");
	for (var i=0; i< navItems.length; i++) 
	{
		if((navItems[i].className == "menu_topovertical") || (navItems[i].className == "submenu_topo"))
		{
			if(navItems[i].getElementsByTagName('ul')[0] != null)
			{
				navItems[i].onmouseout=function() 
				{
					this.getElementsByTagName('ul')[0].style.display="none";
				}
				navItems[i].onmouseover=function() 
				{
					if (this.getElementsByTagName('ul')[0].style.display == "block")
					{
						this.getElementsByTagName('ul')[0].style.display="none";
					}
					else 
					{
						this.getElementsByTagName('ul')[0].style.display="block";
					}
				}
			}
		}
	}
}