function if_email($staff)
{
  //Check the valididty of the email address entered
  if (ereg('^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$', $address))
    return true;
  else 
    return false;
}

function if_email($email)
{
  //Check to make sure this is a valid email address on landau-forte.org.uk
  if (ereg('^[a-zA-Z0-9_\.\-]+@landau-forte.org.uk$', $email))
    return true;
  else 
    return false;
}

function if_email($email) {
 
//Define check
$bademail = '\[USERNAME\]';
//Check that [USERNAME] is not contained in e-mail field
if (ereg($bademail . '@^[\w_\.\-]$', $address))
  return false;
 else if (ereg('^[\w_\.\-]+@[\w\-]+\.[\w\-\.]+$', $address))
  return true;
 else
  return false;
}