function validate(form)
{
	var errors = '';

  if(form.reference.value == '')
  {
		errors += '<p>Please enter the number you were given.</p>';
  }
  else if(!/^[0-9]{6}([0-9]{2})?$/.test(form.reference.value))
  {
    errors += '<p>You need to enter a 6 or 8 digit number.</p>';
  }

  if(errors != '')
  {
    document.getElementById('errors').innerHTML = errors;
    return false;
  }
  
  return true;
}