A real problem

Hi I have this list that interogates the database and display the name of the brand. <select name="brand"> <? $query = "SELECT id, name FROM shop_brands"; $result = mysql_query($query) or die("error in query - $query - ".mysql_error()); while($row = mysql_fetch_row($result)) { list($brand_id, $brand_name) = $row; $query2 = "SELECT * FROM shop_models WHERE brand_id = $brand_id"; $result2 = mysql_query($query2) or die("error in query - $query2 - ".mysql_error()); $rows = mysql_num_rows($result2); if($rows) { $brand_name = htmlspecialchars(stripslashes($brand_name)); if(!$save_brand_id) $save_brand_id = $brand_id; echo("<option value='$brand_id'>$brand_name</option>"); } } ?> each brand has more than one model. when i chose one of the brands i want to be displayed o form like this (in real time): $query = "SELECT id, name FROM shop_models WHERE brand_id=$save_brand_id"; $result = mysql_query($query) or die("error in query - $query - ".mysql_error()); while($row = mysql_fetch_row($result)) { list($model_id, $model_name) = $row; echo ("<input type='checkbox' value=\"$model_id\">$model_name\n"); }; How can i do this? (maybe java could help me but i do not know how to do it) Can someone plese help me? Thanks for your reply