function hideall() {
 if (navigator.appName=="Microsoft Internet Explorer") {
   document.all.menu_3.style.visibility = 'hidden';
   document.all.menu_4.style.visibility = 'hidden';
   document.all.menu_5.style.visibility = 'hidden';
   document.all.menu_6.style.visibility = 'hidden';
   document.all.menu_7.style.visibility = 'hidden';
   document.all.menu_8.style.visibility = 'hidden';
 }
 else { 
   document.getElementById('menu_3').style.visibility = 'hidden';
   document.getElementById('menu_4').style.visibility = 'hidden';
   document.getElementById('menu_5').style.visibility = 'hidden';
   document.getElementById('menu_6').style.visibility = 'hidden';
   document.getElementById('menu_7').style.visibility = 'hidden';
   document.getElementById('menu_8').style.visibility = 'hidden';
 }
}

function show_menu(id) {
 if (navigator.appName=="Microsoft Internet Explorer") { 
   nazwa="menu_"+id;
   document.all[nazwa].style.visibility = 'visible'; 
 }
 else { 
   nazwa="menu_"+id;
   document.getElementById(nazwa).style.visibility = 'visible'; 
 }
}

function hide_one(id) {
if (navigator.appName=="Microsoft Internet Explorer") { 
   nazwa="menu_"+id;
   document.all[nazwa].style.visibility = 'hidden'; 
 }
 else { 
   nazwa="menu_"+id;
   document.getElementById(nazwa).style.visibility = 'hidden'; 
 }
}

function combo(id)
 {
  hideall();
  show_menu(id);
 }

function hide(id) {
hideall();
}