function checkEnquiryForm(theForm)
{
  if (theForm.name.value == '') { alert('Please enter your name.'); theForm.name.focus(); return false; }
  if (theForm.email.value == '') { alert('Please enter your e-mail address.'); theForm.email.focus(); return false; }
  if (theForm.postcode.value == '') { alert('Please enter your postcode.'); theForm.postcode.focus(); return false; }
  if (theForm.comments.value == '') { alert('Please enter a message.'); theForm.comments.focus(); return false; }
  
  return true;
}