01.<?php
02.if(isset($_POST["SubmitForm"],$_POST["allowSubmit"])){
03.
04.}
05.?>
06.
07.<form method="post" >
08.A:<input type='text' name='A' />
09.<input type='checkbox' name='allowSubmit' value='yes' onclick="if(this.checked)document.getElementById('submitBtn').disabled=false; else document.getElementById('submitBtn').disabled=true;" />ยินยอมให้บันทึก<br />
10.<input type='submit' name='SubmitForm' disabled='disabled' id='submitBtn' />
11.</form>
