*/
/** User authentication (abstract class) */
class auth
{
/** Display the authentication page
The message is displayed to the user in case of error
The url is the caller url to go back if authentication is correct
@param string|null $message Message to display to the user
@param string|null $url URL to go back after successful authentication */
public function pageHTML ($message="", $url="")
{
$res = "";
$res .= "\n";
$res .= "\n";
$res .= "\n";
$res .= "Title\n";
$res .= "\n";
$res .= " \n";
$res .= " \n";
$res .= "