function enforceLength (checkme, minlen, maxlen, changeme)
{
  var currentlength;
  var charactersleft;
  
  currentlength = checkme.value.length;
  
  if (currentlength > maxlen )
  {
    checkme.value = checkme.value.substring(0,maxlen);
    charactersleft = 0;
  }
  else
  {
    charactersleft = maxlen - currentlength;
  }
  
  changeme.value = charactersleft;
  return true;
}