flat radio buttons with css?


I would like to have radio buttons with flat borders with css technology.
With textfields, I can do this with border:1px solid [#color]. But it seems that this doesn't work for radio buttons. I also searched with google but didn't find anything...

Does someone know how to make flat radio buttons with css?

thank you,
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AFAIK it can't be done with css only.

An option would be to use 2 images and a bunch of javascript. The 2 images of course representing a checked and unchecked flat radiobutton.
You would get something like this:
      function toggleRadioBtn(e) {
            if (e.src == "") {
                  e.src = "";
                  document.forms[0].radioBtn1.value = 1;
            } else {
                  e.src = "";
                  document.forms[0].radioBtn1.value = 0;
      <img src="/assets/img/radioButtonUnchecked.gif" onclick="toggleRadioBtn(this);">
      <input type="hidden" name="radioBtn1" value="0"/>

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