function isValidEmail($email){

    return eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email);

}

function generatePassword($length=9, $strength=0) {

    $vowels = 'aeuy';

    $consonants = 'bdghjmnpqrstvz';

    if ($strength & 1) {

        $consonants .= 'BDGHJLMNPQRSTVWXZ';

    }

    if ($strength & 2) {

        $vowels .= "AEUY";

    }

    if ($strength & 4) {

        $consonants .= '23456789';

    }

    if ($strength & 8) {

        $consonants .= '@#$%';

    }

    $password = '';

    $alt = time() % 2;

    for ($i = 0; $i < $length; $i++) {

        if ($alt == 1) {

            $password .= $consonants[(rand() % strlen($consonants))];

            $alt = 0;

        } else {

            $password .= $vowels[(rand() % strlen($vowels))];

            $alt = 1;

        }

    }

    return $password;

}

function passwordProtect($username, $password){

    if (

            (

                !isset($_SERVER['PHP_AUTH_USER']) ||

                (

                    isset($_SERVER['PHP_AUTH_USER']) &&

                    $_SERVER['PHP_AUTH_USER'] != $username

                )

            ) &&

            (

                !isset($_SERVER['PHP_AUTH_PW']) ||

                (

                    isset($_SERVER['PHP_AUTH_PW']) &&

                    $_SERVER['PHP_AUTH_PW'] != $password

                )

            )

        )

    {

        header('WWW-Authenticate: Basic realm="Login"');

        header('HTTP/1.0 401 Unauthorized');

        echo 'Please login to continue.';

        exit;

    }

}