Multiple Radio Button values

Experts,

I have 6 radio button options or choices for the user with some other options (text box, dropdown etc) in my CF page and user can check or choose more than one radio button option. So, I would like to get the radio button option  value as comma delimited list in my action file, (like 1,2 OR 1,2,5,3 or 1,2,3,4,5,6 or may be just 1). How can I achive this? Please help me out.

<input type="radio" name="opt1" size="30"  value="1" onDblClick="uncheckOpenRadio();">Option 1
<input type="radio" name="opt2" size="30"  value="2" onDblClick="uncheckAssignRadio();">Option 2      
<input type="radio" name="opt3" size="30"  value="3" onDblClick="uncheckDeclineRadio();">Option 3<br>
<input type="radio" name="opt4" size="30"  value="4" onDblClick="uncheckPrdRadio();">Option 4
<input type="radio" name="opt5" size="30"  value="5" onDblClick="uncheckModeledRadio();">Option 5
<input type="radio" name="opt6" size="30"  value="6" onDblClick="uncheckQuoteRadio();">Option 6

Thanks in advance