<!--
function checkform ( form )
{
  // see http://www.thesitewizard.com/archive/validation.shtml
  // for an explanation of this script and how to use it on your
  // own website

  // ** START **
  if (form.bedrijfsnaam.value == "") {
    alert( "Vul uw bedrijfsnaam in aub." );
    form.bedrijfsnaam.focus();
    return false ;
  }
  // ** END **
  // ** START **
  if (form.naam.value == "") {
    alert( "Vul uw naam in aub." );
    form.naam.focus();
    return false ;
  }
  // ** END **
  // ** START **
  if (form.email.value == "") {
    alert( "Vul uw email adres in aub." );
    form.email.focus();
    return false ;
  }
  // ** END **
  // ** START **
  if (form.telefoon.value == "") {
    alert( "Vul uw telefoon nummer in aub." );
    form.telefoon.focus();
    return false ;
  }
  // ** END **
  return true ;
}
//-->