<form id="my_radio_box">
<input type="radio" name="my_options" value="option 1"> Option 1
<input type="radio" name="my_options" value="option 2"> Option 2
<input type="radio" name="my_options" value="option 3"> Option 3
</form>

$(document).ready(function(){
    $('#my_radio_box').change(function(){
        alert('Radio Box has been changed!');
    });
});

$(document).ready(function(){
    $('#my_radio_box radio').change(function(){
        alert('Radio Box has been changed!');
    });
});