function horizontal() {

 

   var navItems = document.getElementById("menu_dropdown").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.backgroundImage = "url(http://www.sbz.org.br/lib/tpl/sbz/imgs/bg_menu_light2.gif)"; this.style.backgroundPosition="center"; this.style.backgroundRepeat = "no-repeat"; this.style.color="black";}

            navItems[i].onmouseout=function() {this.getElementsByTagName('ul')[0].style.display="none";this.style.backgroundColor = ""; this.style.backgroundImage = "";}

         }

      }

   }

 

}