function vertical() 
{
 
   var navItems = document.getElementById("mdd").getElementsByTagName("li");
    
   for (var i=0; i< navItems.length; i++) 
   {
      if(navItems[i].className == "menu_0")
      {
         if(navItems[i].getElementsByTagName('ul')[0] != null)
         {
            navItems[i].onmouseover=function() {this.getElementsByTagName('ul')[0].style.display="block";this.style.backgroundColor = "none";
		 }
           navItems[i].onmouseout=function() 
		 {
		 this.getElementsByTagName('ul')[0].style.display="none";this.style.backgroundColor = "none";
		 }
         }
      }
   }
 
}