function einaus (openmenu)
  {
   var openmenu="menuu";
   var status;
   status=document.all[openmenu].style.visibility
	  
     if (status=="hidden")
	{
	document.all[openmenu].style.visibility="visible";
	}
     if (status=="visible")
	{
	document.all[openmenu].style.visibility="hidden";
	}
  }