function hidden_display(id)
{
 if (navigator.appName=="Microsoft Internet Explorer") { 
    if (document.all[id].style.visibility == 'visible') {
          document.all[id].style.visibility = 'hidden';
          document.all[id].style.display = 'none';
      }
    else {
       document.all[id].style.visibility = 'visible';
       document.all[id].style.display = 'block';
      }
 }
 else { 
  
    if (document.getElementById(id).style.visibility == 'visible') {
          document.getElementById(id).style.visibility = 'hidden';
          document.getElementById(id).style.display = 'none';
      }
    else {
       document.getElementById(id).style.visibility = 'visible';
       document.getElementById(id).style.display = 'block';
      }
 }
}
function hidden(id)
{
   document.getElementById(id).style.visibility = 'hidden';
   document.getElementById(id).style.display = 'none';
}
function display(id)
{
   document.getElementById(id).style.visibility = 'visible';
   document.getElementById(id).style.display = 'block';
}