01.<html>
02.<head>
03.<script type="text/javascript">
04.function show_alert()
05.function openpany()
06.{
07. document.getElementById('company').disabled = false;
08.}
09.function offpany()
10.{
11. document.getElementById('company').disabled = true;
12. document.getElementById('company').value ="";
13.}
14.</script>
15.</script>
16.</head>
17.<body>
18.
19.<input name="choice" type="radio" id="radio" value="เลือก1" onchange="offpany();" /> เลือก1<br />
20. <input name="choice" type="radio" id="radio" value=" เลือก2" onchange="openpany();"/>
21. เลือก2 (กรอกชื่อข้อมูล)<br />
22. <input name="company" type="text" disabled="disabled" id="company" value="" size="50"/>
23.
24.</body>
25.</html>
