How to server side validate these radio buttons

[Will Tomlinson]

I have a form with dynamically created radio buttons. They look like this in 
the source:

      <tr class="background-hilite">
        <td align="center" width="25">1</td>
        <td>You'd like a place to smoke on campus</td>
        <td width="200">
     <table align="center" width="100%"  border="0" cellspacing="0" 
cellpadding="2">
        <tr class="background-hilite">                  
        <td align="center" width="25%">SA<br />
          <input name="Q_question1" id="Q_question1" type="radio" value="1_1" />
        </td>                   
        <td align="center" width="25%">A<br />
          <input name="Q_question1" id="Q_question1" type="radio" value="1_2" />
        </td>           
        <td align="center" width="25%">N<br />
          <input name="Q_question1" id="Q_question1" type="radio" value="1_3" />
        </td>                   
        <td align="center" width="25%">D<br />
         <input name="Q_question1" id="Q_question1" type="radio" value="1_4" />
        </td>                   
        <td align="center" width="25%">SD<br />
         <input name="Q_question1" id="Q_question1" type="radio" value="1_5" />
        </td>              
        </tr>           
      </table>
    </td>
     </tr>

I'm looping over the fieldnames,inserting the values into the db, workin just 
fine. 

What's the best way to server side validate to make sure at least ONE radio 
button per set was selected? 

Here's my loop insert in case that helps ( don't pay attention to the no 
<cfqueryparam>s, just testing this out:


<!--- Loop over fieldnames adding to db --->
<cfloop list="#FORM.fieldnames#" index="thisField">
   <cfif ListFirst(thisField, "_") EQ "Q">
    <cfquery datasource="#SESSION.DSN#">
    INSERT INTO tblevalanswerresults (answerID, questionID, questionsetID)
    VALUES (#ListLast(FORM[thisField], "_")#, #ListFirst(FORM[thisField], 
"_")#,                              #FORM.questionset#)
    </cfquery>
   </cfif>
</cfloop>



Thanks,
Will

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