Data population in Cold Fusion

Hi,
  I have a CFM page where I list Category along with CategoryID in the drop down.
  I like to be able to populate Category ID (in parenthesis) in the Category ID field when user selects the category from the drop-down menu.
  For example, when the user selects "Picture Frames", then I want the page to populate 23 automatically into Category ID field as seen in the screenshot above.
  Here are the codes in my CFM page

<CFQUERY NAME="GetCategory" datasource="DNSName" cachedWithin="#CreateTimeSpan(0,1,0,0)#">
      SELECT      *
         FROM         Category
      ORDER BY Category
</CFQUERY>

    <TR bgcolor="B5D083">
        <TD>
           Category ID:
        </TD>
        <TD>
      <CFINPUT TYPE="text" NAME="CategoryID" SIZE=3 MAXLENGTH=3> Category Lookup:
                  <SELECT NAME="CategoryID">
                    <OPTION VALUE="0"></OPTION>
                  <CFOUTPUT query="GetCategory">
                  <OPTION VALUE="#ID#">#Category#/(#ID#)</OPTION>
                  </CFOUTPUT>
                  </SELECT>        </TD>
    </TR>