function horizontal() 
{
 
   var navItems = document.getElementById("menu_dropdown").getElementsByTagName("li");
    
   for (var i=0; i< navItems.length; i++) 
   {
      if(navItems[i].className == "semsubmenu")
      {
            navItems[i].onmouseover=function() 
			{ this.style.backgroundColor = "#d5e6f2"; }
            navItems[i].onmouseout=function() 
			{ this.style.backgroundColor = "#e9e6d9"; }
	  }


      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 = "#d5e6f2";}

			navItems[i].onmouseout=function() 
			{this.getElementsByTagName('ul')[0].style.display="none";this.style.backgroundColor = "#e9e6d9";}
         }
		 
	  }


   }
 

}

window.onload = horizontal;