Checkboxes

I have this script: Each brand has more that one model. When i chose a brand it displays chackboxes for each model in a form.. Now i want to select some models and introduce them into database. How can i do that. This script display the each model, but wen i chose some of them the form doesn't work. . <FORM METHOD=POST ACTION="add_prodrel.php" enctype="multipart/form-data" NAME="doublecombo"> <? $query12 = "SELECT id, brand_id, model_id FROM shop_items WHERE id='$showdetail'"; $result12 = mysql_query($query12) or die("error in query - $query12 - ".mysql_error()); while($row = mysql_fetch_row($result12)) { list($id, $brand_id, $model_id) = $row; $query3 = "SELECT id, brand_id, name FROM shop_models WHERE brand_id='$brand_id'"; $result3 = mysql_query($query3) or die("error in query - $query3 - ".mysql_error()); while($row = mysql_fetch_row($result3)) { list($id, $brand_id, $name) = $row; echo "&nbsp;&nbsp;<input type='checkbox' name='".$name."' value='".$id."'>&nbsp;&nbsp;$name<br>"; } } ?> <INPUT TYPE="hidden" name="add" value="set"><INPUT TYPE="submit" name="submit" value="Ajouter"> </form>