function horizontal() { var navItems = document.getElementById("menu1").getElementsByTagName("li");
    for (var i=0; i< navItems.length; i++) 
     { if(navItems[i].className == "submenu")
      { if(navItems[i].getElementsByTagName('ul')[0] != null)
         { navItems[i].onmouseover=function() {this.getElementsByTagName('ul')[0].style.display="block";
               this.style.backgroundColor = "#fff";}
                  navItems[i].onmouseout=function()                     {this.getElementsByTagName('ul')[0].style.display="none";
                      this.style.backgroundColor = "#fff";}}}}}