// makes menu visible
function mnuOn(numero){
  if(document.getElementById)document.getElementById("submnu"+numero).style.visibility="visible";
  else if(document.all)document.all["submnu"+numero].style.visibility="visible";
};


// hides menu 
function mnuOff(numero){
  if(document.getElementById)document.getElementById("submnu"+numero).style.visibility="hidden";
  else if(document.all)document.all["submnu"+numero].style.visibility="hidden";
};