I have a radio input, code like below:

<Form name="test" action="test.asp" method="post">
<td><input type="button" value="1">New</td>
<td><input type="button" value="2" checked>old</td>
<td><select name="StartYear" >
 <% for nm = 1980 to (year(now)-1) %>
 <option value='<%=nm%>'><%=nm%></option>
 <% next %>
 </select>
</td>
</Form>
BUT NOW, I want to base on which button choosed, to set up different pulldown list.: like if <input type="button" value="1">choosed, I am gonna show the pull down list as:
<Form name="test" action="test.asp" method="post">
<td><input type="button" value="1">New</td>
<td><input type="button" value="2" checked>old</td>
<td><select name="StartYear" >
 <% for nm = 1980 to year(now)%>
 <option value='<%=nm%>'><%=nm%></option>
 <% next %>
 </select>
</td>

Is it possible for me to do that? if "yes", how? Thank you very much for any suggestion.

First <input type="button" value="2" checked>old generates a button, not a radiobutton so it does not have a CHECKED attribute.

Second, yes it is possible to populate a dropdown based on a radio button decision and you will want to look into javascript to do this. (You could post back to the server to populate the dropdown, but I think javascript is a better route)

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Discussion:
http://p2p.wrox.com/topic.asp?TOPIC_ID=56429

Thanks for ur answer