Like checkboxes, radio buttons should have the input first, followed by the label.
<fieldset>
<legend>Empty my bank account to pay for dog food:</legend>
<input id="emptyacct" type="radio" name="account" value="radiobutton" />
<label for="emptyacct">Yes </label>
<input id="dontempty" type="radio" name="account" value="radiobutton" />
<label for="dontempty">No</label>
</fieldset>