forgoten

hi im tring to connect to a mysql server but i keep geting this error: Connection failed: could not find driver i am using the folowing code to connect: try { $this->DbObj = new PDO( 'mysql:host=' . $this->ConfigObj->Host . ';dbname=' . $this->ConfigObj->DbName, $this->ConfigObj->User, $this->ConfigObj->Pass, array( PDO::ATTR_PERSISTENT => false )); $this->DbObj->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $Excep) { exit('Connection failed: ' . $Excep->getMessage()); } anyone know whats wrong there?.....i used to use the same code befor i moved to a new server so coud use some help...tnx