Enabling/disabling buttons

[ramu_indian]

I've a "reply" button. And a sequence of messages arranged in a table.
Now I want that reply button to be in disabled state till I select one of the messages.(just like in Outlook).

I want to enable 'reply' onselecting a particular message.

I've button like this
<input type="button" value="reply" onclick="submitReply(this.form);">

And the messages are placed in the following manner:
<td width="32%" onClick="SHOWMESSAGE")>
<%=MessageSubject%> </td>

regards
and thanx in advance
RK

[phpnovice]

Place the disabled attribute in your reply button HTML to start with -- and, give your reply button a name attribute. Then:

document.forms["myFormName"].elements["myButtonName"].disabled = false;