<form name=fm1>
<INPUT id=checkbox1 name=checkbox1 type=checkbox>
<SELECT id=select1 name=select1 size=1 style="HEIGHT: 38px; WIDTH: 120px">
<OPTION>abc</OPTION>
</SELECT>
</form>function document.onclick ()
{
var e = document.forms[0]
if (e.checkbox1.checked)
{e.select1.disabled = true}
else
{e.select1.disabled = false}
}
<INPUT id=checkbox1 name=checkbox1 type=checkbox>
<SELECT id=select1 name=select1 size=1 style="HEIGHT: 38px; WIDTH: 120px">
<OPTION>abc</OPTION>
</SELECT>
</form>function document.onclick ()
{
var e = document.forms[0]
if (e.checkbox1.checked)
{e.select1.disabled = true}
else
{e.select1.disabled = false}
}
<form name=fm1>
<INPUT id=checkbox1 name=checkbox1 type=checkbox onclick=change() checked>
<SELECT id=select1 name=select1 size=1 style="HEIGHT: 38px; WIDTH: 120px">
<OPTION>abc</OPTION>
</SELECT>
</form>
<script>
function change()
{
var e = document.forms[0]
if (e.checkbox1.checked)
{e.select1.disabled = true}
else
{e.select1.disabled = false}
}</script>
<SELECT id=select1 name=select1 size=1 style="HEIGHT: 27px; WIDTH: 204px" >
<OPTION></OPTION>
</SELECT>
<INPUT id=checkbox1 name=checkbox1 type=checkbox checked>
</form><SCRIPT LANGUAGE=javascript>
function window.onload()
{
var e = document.forms[0]
if (e.checkbox1.checked)
{e.select1.disabled = true}
else
{e.select1.disabled = false}
}
</SCRIPT>ID 用不用都無所謂(你也可以使用數組).在這裡是為了給你看這方便.