function showhide(state) {
   var cacheobj = document.getElementById("downmenu").style
   if (state == 0)
      cacheobj.visibility = "hidden"
   else
      cacheobj.visibility = cacheobj.visibility == "hidden" ? "visible" : "hidden"
}

function showhide2(state) {
   var cacheobj = document.getElementById("downmenu2").style
   if (state == 0)
      cacheobj.visibility = "hidden"
   else
      cacheobj.visibility = cacheobj.visibility == "hidden" ? "visible" : "hidden"
}

function showhide3(state) {
   var cacheobj = document.getElementById("downmenu3").style
   if (state == 0)
      cacheobj.visibility = "hidden"
   else
      cacheobj.visibility = cacheobj.visibility == "hidden" ? "visible" : "hidden"
}

function showhide4(state) {
   var cacheobj = document.getElementById("downmenu_all").style
   if (state == 0)
      cacheobj.visibility = "hidden"
   else
      cacheobj.visibility = cacheobj.visibility == "hidden" ? "visible" : "hidden"
}