function SetNav(param)
{
  if(param.top && param.top != 'undefined')
  {
    var _current = document.getElementById('navMain' + param.top);
    
    if(param.top > 1)
    {
      _current.className = 'current';
      _current.previousSibling.className = 'bcurrent';
    }
    else
      _current.className = 'leftcorner';
  }
}