On document ready, to find the value of the check radio button, use the id together with ‘checked’. E.g.:
$('#myradiobutton:checked').val();/>
However, to trigger a click function on the radio button, id wasn’t recognised, but the input name was. E.g.:
$('input[name=myradiobutton]').click(function{});
Perhaps it’s better to use the input name, rather than the id.