kanske kan hjälpa dig:
http://www.quirksmode.org/js/forms.html#sradio skrev:
for (i=0;i<document.forms[0].radios.length;i++) {
if (document.forms[0].radios*.checked) {
user_input = document.forms[0].radios*.value;
}
}**
http://www.yourhtmlsource.com/javascript/formvalidation.html skrev:
if (!document.feedback.field[0].checked &&
!document.feedback.field[1].checked &&
!document.feedback.field[2].checked) {
// no radio button is selected
return false;
}