01.
<script language=
""
>
02.
function
chkValue(vol)
03.
{
04.
if
(vol ==
"2"
)
05.
{
06.
document.form1.txtArea.disabled=
true
;
07.
}
08.
}
09.
</script>
10.
11.
<select name=
"abc"
OnChange=
"JavaScript:chkValue(this.value)"
>
12.
<otpion value=
"1"
>xxx</option>
13.
<otpion value=
"2"
>yyy</option>
14.
<otpion value=
"3"
>zzz</option>
15.
</select>