The tab order of radio buttons only goes to the tab group (not each individual radio button within the group).
There is a hack using a label and tab order, but this doesn't work probably in IE.
(see below)
<html>
<body><form>
<p>These radio buttons have a label, so tabindex goes to the label for
the radio button, which in turn gives the radio button focus<BR>
Group1 First:
<input type="radio" checked="checked" name="Group1" value="11" tabIndex="1">
<br>
Group1 Second:
<LABEL for="fname" tabIndex="2"></LABEL>
<input type="radio" name="Group1" value="12" id="fname" tabIndex="3" >
</P>
<p>These don't have a label, so tab only to the RadioGroup</p>
Group2 First:
<input type="radio" name="Group2" value="21" checked>
<br>
Group2 Second:
<input type="radio" name="Group2" value="22" >
<p>
Standalone RadioGroups</P>
Group3 First:
<input type="radio" name="Group3" value="3" >
<br>
Group4 First:
<input type="radio" name="Group4" value="3" >
<br>
</form>
