current="";


function MM_showHideLayers() { //v9.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3)
  with (document) if (getElementById && ((obj=getElementById(args[i]))!=null)) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}

function openmenu()
{
args=openmenu.arguments;

 menu="menu_" + args[0];
 cmenu="menu_"+ current;
 if ( current == args[0]) { cmenu="1000";}
 MM_showHideLayers(menu,'','show',cmenu,'','hide');
current = args[0];
}


function closemenu()
{
menu="menu_" + current;
MM_showHideLayers(menu,'','hide');
current="";
}