Warnings being posted for quests

Warning: Supplied argument is not a valid MySQL result resource in /www/cgi/account/include/database.php on line 459

Warning: Cannot send session cache limiter - headers already sent (output started at /www/cgi/account/include/database.php:459) in /www/cgi/account/include/session.php on line 50

Warning: Supplied argument is not a valid MySQL result resource in /www/cgi/account/include/database.php on line 459

Warning: Supplied argument is not a valid MySQL result resource in /www/cgi/account/include/database.php on line 459

database.php lines 451-460

[code ]/**
* calcNumActiveGuests - Finds out how many active guests
* are viewing site and sets class variable accordingly.
*/
function calcNumActiveGuests(){
/* Calculate number of guests at site */
$q2 = "SELECT * FROM ".TBL_ACTIVE_GUESTS;
$result2 = mysql_query($q2, $this->connection);
$this->num_active_guests = mysql_num_rows($result2); /*line 459*/
}[/code]

session.php lines 48 - 81

Code:


function startSession(){
      global $database;  //The database connection
      session_start();  //Tell PHP to start the session line 50

      // Determine if user is logged in
      $this->logged_in = $this->checkLogin();

      //
      // Set guest value to users not logged in, and update
      // active guests table accordingly.
     
      if(!$this->logged_in){
        $this->username = $_SESSION['username'] = GUEST_NAME;
        $this->userlevel = GUEST_LEVEL;
        $database->addActiveGuest($_SERVER['REMOTE_ADDR'], $this->time);
      } else {// Update users last active timestamp
        $database->addActiveUser($this->username, $this->time);
      
      }
     
      // Remove inactive visitors from database
      $database->removeInactiveUsers();
      $database->removeInactiveGuests();
     
      // Set referrer page
      if(isset($_SESSION['url'])){
        $this->referrer = $_SESSION['url'];
      } else {
        $this->referrer = "/";
      }

      // Set current url
      $this->url = $_SESSION['url'] = $_SERVER['PHP_SELF'];
  }