This may be completely inappropriate for your situation, but you can force one of the buttons to be selected by default.
<input name="color" type="radio" value="red">
<input name="color" type="radio" value="green">
<input name="color" type="radio" value="blue" checked>

[download]
This sets Blue as the default value. The downside may be that
  1. If the user doesn't notice, the wrong color may be indicated
  2. The user cannot unselect a value for that button
This is often a bad idea, but occasionally useful.

-theo-
(so many nodes and so little time ... )
Note: All opinions are untested, unless otherwise stated

In reply to Re: Validating form data by Theo
in thread Validating form data by Anonymous Monk

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