How to get value of selected radio button?

Question

I want to get the selected value from a group of radio buttons.

Here\'s my HTML:

Answer 1

An improvement to the previous suggested functions:

function getRadioValue(groupName) {
    var _result;
    try {
        var o_radio_group = document.getElementsByName(groupName);
        for (var a = 0; a < o_radio_group.length; a++) {
            if (o_radio_group[a].checked) {
                _result = o_radio_group[a].value;
                break;
            }
        }
    } catch (e) { }
    return _result;
}