function menuHorizontal() {
   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.backgroundColor = "#CC3A2F";
            }
            navItems[i].onmouseout=function() {
              this.getElementsByTagName('ul')[0].style.display="none";
              //this.style.backgroundColor = "#b9332a";
            }
         }
      }
   }

}
//window.onload = menuHorizontal;