var seelt="null";

function start(){
  if (navigator.appName == "Netscape"){
    docuRef="document.layers";
    stylelt="";
    seelt="show";
  }
  else{
    docuRef="document.all";
    stylelt=".style";
    seelt="visible";
  }
}
function toggleMenu(menuName){
  if (eval(docuRef+'["'+menuName+'"]'+stylelt+'.visibility==seelt')){
    hideMenu(menuName);
  }else{
    showMenu(menuName);
  }
}
function showMenu(menuName){
  eval(docuRef+'["'+menuName+'"]'+stylelt+'.visibility=seelt');
}
function hideMenu(menuName){
  eval(docuRef+'["'+menuName+'"]'+stylelt+'.visibility="hidden"');
}