function preview()
{
  document.forms["ncomment"].elements["function"].value="preview";
  document.forms["ncomment"].submit();
}

function checkForm()
{
  if(WAS_SUBMITTED == 1) return false;
  var els = document.forms['ncomment'].elements;
  if(els['c[guest]'].value == '')
  {
    alert('Please fill in your name.');
    els['c[guest]'].focus();
    return false;
  }
  if(els['c[comment]'].value.length == 0)
  {
    alert('Please leave a comment.');
    return false;
  }
  if(els['function'] == 'post')
  {
    els['btn_postit'].value='Please wait...';
    WAS_SUBMITTED = 1;
  }
  return true;
}