if (document.layers) // Got Netscape <= 4
{
  visible = 'show';
  hidden = 'hide';
}
else if (document.all) // Got IE
{
  visible = 'visible';
  hidden = 'hidden';
}
else //Netscape 6
{
  visible = 'visible';
  hidden = 'hidden';
}

menuNames = new Array('aboutMenu',
                      'newsMenu',
                      'employmentMenu',
                      'equalityMenu',
                      'getMenu',
                      'trainingMenu',
                      'contactMenu',
                      'mattersMenu',
                      'skillsMenu');


function menuDisp(num)
{
  for (var j=0 ; j<menuNames.length ; j++)
  {
    menu = menuNames[j];
    
    if (document.layers) // NS <= 4
    {
      myMenu = document.layers[menu];
    }
    else if (document.all) // IE
    {
      myMenu = document.all(menu).style;
    }
    else // NS 6
    {
      myMenu = document.getElementById(menu).style;
    }

    if (!isNaN(num))
    {
      if (menuNames[num] != menuNames[j])
      {
        myMenu.visibility = hidden;
      }
      else
      {
        myMenu.visibility = visible;
      }
    }
    else
    {
      myMenu.visibility = hidden;
    }
  }
}