Hvorfor virker dette ikk!

Kode 

<?php
	switch($_POST['recover']){ 
    default: 
    break;
    case "recover": 
    recover_pw($_POST['email_address']); 
    break; 
} 
function recover_pw($email_address){ 
    if(!$email_address){ 
        echo "Du glemte at skrive din email adresse! 
            Hvordan havde du tænkt dig at du skulle få dit password!"; 
    exit(); 
    } 
    // quick check to see if record exists     
    $sql_check = mysql_query("SELECT * FROM users WHERE email_address='$email_address'"); 
    $sql_check_num = mysql_num_rows($sql_check); 
    if($sql_check_num == 0){ 
        echo "Den indtastede email findes ikke!"; 
        exit(); 
    } 
    // Everything looks ok, generate password, update it and send it!
    function makeRandomPassword() { 
          $salt = "abchefghjkmnpqrstuvwxyz0123456789"; 
          srand((double)microtime()*1000000);  
          $i = 0; 
          while ($i <= 7) { 
                $num = rand() % 33; 
                $tmp = substr($salt, $num, 1); 
                $pass = $pass . $tmp; 
                $i++; 
          } 
          return $pass; 
    }
    $random_password = makeRandomPassword();
    $db_password = md5($random_password);
    $sql = mysql_query("UPDATE users SET password='$db_password' 
                WHERE email_address='$email_address'");
    $subject = "PASSWORD!"; 
    $message = "Hej, vi har sendt dig et nyt password!.
    Dit nye kodeord: $random_password 
    http://www.est.frac.dk/login_form.php 
    Tak! 
    Team sjoveren.dk 
    Denne email er blevet sendt automatisk, så det er ikke muligt at svare!"; 
    mail($email_address, $subject, $message, "From: NYT PASSWORD< noreply@sjoveren.dk>\\n 
        X-Mailer: PHP/" . phpversion()); 
    echo "Dit nye password er blevet sendt til din email adresse!"; 
}

	  }
if($_GET[mode] == "lost_pw") {
	echo "<form action='$_SERVER[PHP_SELF]' method='post'>";
	echo "<strong>Email adresse</strong> <input type='text' name='email_address' style='background-color:#CCCCCC; border:1px solid #999999; font-family:tahoma; font-size:11px;' /> <input type='submit' name='recover' value='Send nyt kodeord' style='background-color:#CCCCCC; border:1px solid #999999; font-family:tahoma; font-size:11px;' />";
	echo "</form>";
}
?>