kde ej chyba

ahoj,
skusal som si spravit classu na myslqli, ale nejde nieco. ;( nepoviete mi pls, ze kde je chyba?

<?php

class Tomimysqli extends Mysqli{



	

	function __construct(){

		$this->spent_time = 0;

	}

	

	function tquery($query){ // chcel by som to radsej pomenovat query, aby to bolo rovnake ako v MyslqI, ale zrejme neda sa ;(((

		$t1 = microtime();

		$q = $this->query($query);

		$t2 = microtime();

		

		$this->spent_time += $t2 - $t1;

		

		return $q;

	}

	

	function show_spent_time(){

		return $this->spent_time;

	}













}

$db_host="localhost";

$db_nick="root";

$db_pass="vertrigo";

$db_name="progyfixinkosk";





$mysqli = new Tomimysqli($db_host,$db_nick,$db_pass,$db_name);





$q = $mysqli->tquery("SELECT * FROM usrs");

while($lajn = $q->fetch_array()){

	echo $lajn["id"];

}







?>

dodavam, ze pise:
Warning: mysqli::query() [function.mysqli-query]: Couldn't fetch Tomimysqli in C:Program FilesVertrigoServwwwOOP omi_mysqli.php on line 11

Fatal error: Call to a member function fetch_array() on a non-object in C:Program FilesVertrigoServwwwOOP omi_mysqli.php on line 39

ee ;(