var checkflag = new Array();
check_all = function(name)
{
  if (!checkflag[name])
  {
    for (i = 0; i < document.getElementsByName(name).length; i++)
    {
      document.getElementsByName(name)[i].checked = true;
    }
    checkflag[name] = true;
  }
  else
  {
    for (i = 0; i < document.getElementsByName(name).length; i++)
    {
      document.getElementsByName(name)[i].checked = false;
    }
    checkflag[name] = false;
  }
}

count = function(name)
{
  var counter = 0;
  for (i = 0; i <  document.getElementsByName(name).length; i++)
  {
    if (document.getElementsByName(name)[i].checked)
    {
      counter++;
    }
  }
  return counter;
}