submitting radiobuttons

[Guru]

I have a set of radio buttons

<INPUT id=r2 type=radio name=r2 value=1>
<INPUT id=r2 type=radio name=r2 value=2>
<INPUT id=r2 type=radio name=r2 value=3>
<INPUT id=r2 type=radio name=r2 value=4>
<INPUT id=r2 type=radio name=r2 value=5>

I can get the selected value from the querystring as long as one of them is selected.

If none is selected, r2 does not even appear ion the query string

I do not want to set a default option but I DO want to something to be submited eg 0 if nothing is selected

[Guru]

OK,OK you can all stop looking now

I've sussed it myself.