Dynamic Form checking

hi this is the dynamic forms ---------------------------------------------------------------------------------------------------------------------------------------------------------------- for($s=0;$s<$num;$s++) { $result = mssql_fetch_array($query); $result[2] = number_format($result[2], 2); echo "<tr border=1>"; echo "<td><input type=\"text\" name=\"item\" size=40 value=$result[0] disabled> </td>"; echo "<td><input type=\"text\" name=\"amount\" size=7 value=$result[2] disabled></td>"; echo "<td><input type=\"text\" name=\"quantity[]\" size=7></td>"; echo "<td><input type=\"text\" name=\"discount[]\" size=7 value=\"0\"></td>"; echo "<input type=\"hidden\" name=\"part_no[]\" value=\"$result[0]\">"; echo "<input type=\"hidden\" name=\"price[]\" value=\"$result[2]\">"; echo "<input type=\"hidden\" name=\"salesperson_code[]\" value=$salesperson_code>"; echo "<input type=\"hidden\" name=\"customer_code[]\" value=$customer_code>"; echo "<input type=\"hidden\" name=\"ship_to_code[]\" value=$ship_to_code>"; echo "<input type=\"hidden\" name=\"date[]\" value=\"$date\">"; echo "<input type=\"hidden\" name=\"status[]\" value=\"0\">"; echo "<td><input type=\"checkbox\" name=\"check[]\" value=\"$s\"></td>"; echo "</tr>"; } ---------------------------------------------------------------------------------------------------------------------------------------------------------------- this the code that will get items that are checked foreach($check as $checkitem) { echo $quantity[$checkitem] . " " . $discount[$checkitem] . " " . $part_no[$checkitem] . " " . $price[$checkitem] . " " . $salesperson_code[$checkitem] . " " . $customer_code[$checkitem] . " " . $ship_to_code[$checkitem] . " " . " " . $status[$checkitem] . " " . $date[$checkitem] . "<br>"; } ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- the problems / situation how can i check or validate it should be. if someone filled up the $quantity[] field, she / he must check the $check[] field or if a use check the $check[] field he must put something on the $quantity[] field. and otherwise empty $quantity[] field and empty $check[] field is allowed, thanks in advance