Hello again. Thanks for last answere. It works very well but now I have another remarkable things. Perhaps logic but not for me yet.. I have this source code: (In norwegian but I translate my thoughts through it in english.) The problem with this source code is that it work very well if I select one single item and post it. But when select 2 or more items the same amount are filled in all field named stk_pa_lager in the database. // count and increase the amount of tubes. if(isset($_POST['oppdater_antall_stk_rorladning'])){ // Get store $valgt_lager = $_POST['valgt_lager']; // Get serial number (Array <input type="number" name="varenr[] size="3">) $varenr = $_POST['varenr']; // number of items in store $stk_pa_lager = $_POST['stk_pa_lager']; // Create an array (<input type="number" name="oppdater_antall_stk_rorladning[] size="3">) $oppdater_antall_stk_rorladning = $_POST['oppdater_antall_stk_rorladning']; // Extract the array and save it induvidual as items in $rorladning foreach($oppdater_antall_stk_rorladning as $rorladning){ // Multiply and add new items to that one already is in store $oppdatert_antall_stk_rorladning = $stk_pa_lager + $rorladning; // Extract serialnumber and save them one by one in $vnr foreach($varenr as $vnr){ // Connect to MySQL database include('../../tilkobling.php'); // Update table rorladning $sql = "UPDATE rorladning SET stk_pa_lager = '$oppdatert_antall_stk_rorladning' WHERE valgt_lager = '$valgt_lager' AND varenr = '$vnr'"; mysql_query($sql, $tilkobling) or die(mysql_error()); } // Output the result to screen echo "<p>Rørladning med varenr: <b>$vnr</b> er oppdatert fra <b>$stk_pa_lager</b> til <b>$oppdatert_antall_stk_rorladning</b> på lager: <b>$valgt_lager</b>.</p>"; //echo "$oppdatert_antall_stk_rorladning<br>"; unset($rorladning); unset($vnr); } } // My database table: mysql> SELECT * FROM rorladning; +------------+-------------+-------+-------------+--------------+---------+--------------+-------------+ | leverandor | valgt_lager | un_nr | varenavn | varenr | dim_mm | stk_pa_lager | kg_pa_lager | +------------+-------------+-------+-------------+--------------+---------+--------------+-------------+ | Orica | Tengs | 0081 | Hvit Rør | ETX1.22X1000 | 22x1000 | 70 | 3.7 | | Orica | Tengs | 0081 | Orange Rør | ETX1.17X460 | 17x460 | 70 | 0.95 | +------------+-------------+-------+-------------+--------------+---------+--------------+-------------+ 2 rows in set (0.00 sec) mysql> What I think i am doing wrong is the way I write the php/mysql stuff. What I want is to store differt values in stk_pa_lager based on the particular serialnumber. (field varenr). I will be very thankful if you can tell me what is wrong here and point out what to do with it. Thanks for your time. Karl