Creating a new drop down menu when an option in an existing one is chosen

Question

I’m using Coldfusion 9,0,0,251028 on Windows 7 64-bit, with a Microsoft Access 97 database. 
I’m having a problem with using a drop-down menu to create another one below it once a certain option is selected
(in this case, the option named “Breaking News”, which has an id of 31).
What event trigger should I use to create a drop-down menu underneath the first one when “Breaking News” is selected? 
Should I be using Javascript for something like this, or can Coldfusion handle it?
Here’s the code:
<cfquery name="get_info" datasource="#db#">
select * from lists
order by department asc, list asc
</cfquery>
<div align="left">
          <select name="list">
                 <option value="-1" selected> --------------------------------------  
                 <cfoutput query="get_info" group="department">
                        <cfoutput group="list">
             <cfif list neq "Breaking News Cell Phone">
                     <option value="#id#">#list#
             </cfif>
                        </cfoutput>
              <option value="-1"> --------------------------------------
                 </cfoutput>
          </select>
</div>

Answer 1

Depending on the details, I might use ColdFusion to create the content of the second drop down.
The second drop-down is supposed to be an expiration date that gets attached to the message so it can be self-removing.
The first drop-down is to specify a category for a message to be sent out on.
In this case, the only one that needs the secondary expiration drop-down is a single category (Breaking News),
so all other options on the drop-down would have to not trigger the expiration date drop-down showing.
In that situation, would you use ColdFusion to create the second drop down?