check variable in mysql table with php -

i want check variable in mysql table , action done if fits. want check whether logged in account has type = d. if so, should redirected, if not normal html code should appear. now, gets completly ignored.

this code

<?php require_once("./include/membersite_config.php");        session_start();     if(!$fgmembersite->checklogin()) {     $fgmembersite->redirecttourl("login.php");     exit; }     else {         $now = time(); // checks time, homepage gets loaded          if ($now > $_session['expire']) {             session_destroy();              header("location: http://www.uni-landau.de/vivian/source/expiredlogin/expiredloginlayout.php");         exit();     }     else {     ?>     <?php include "connect.php"?>     <?php include "functions.php"?>     <?php          $check_login = mysql_query("select type users username='$username'");             $run = mysql_fetch_array($check_login);             $type = $run ['type'];              if ($type == 'd'){                  header("location: http://www.blubb.php");        }         else {  //starts html area  ?> 

the code in beginning time check , session_destroy works fine. after else { $check_login = mysql_query [...] gets ignored , page loads if account log in $type == 'd' . can push me in right direction?

ps: variables in mysql table correct.

thanks in advance.

edit:

the value $username in included function.php:

<?php  session_start();  function loggedin() { if(isset($_session['id_user']) && !empty($_session['id_user'])){      return true;  } else {     return false;   }  }    if(loggedin()){  $user_query = mysql_query("select username, user_level users id='$my_id'");  $run_user = mysql_fetch_array($user_query);  $username = $run_user['username'];  $user_level = $run_user ['user_level'];  ?> 

this connect.php db connection:

<?php  mysql_connect ("host" , "name", "psw"); mysql_select_db("users");  ?> 

here in section make sure if condition satisfied.no errors in code

if ($type == 'd'){            header("location: http://www.blubb.php");           }