i have this example code:

 while ($row = mysql_fetch_object($result1)) {                  

                    echo '<input type=radio name=vote value='.$row->avalue.'/>&nbsp;';

                    echo '<label >'.$row->atitle.'</label><br>';

                }

this displays 4 radio buttons alongwith their labels.
now I am using the following jquery function to POST.

$(#submit_js).click(function() {

    $.post(

    user_submit.php, 

    {//how to POST data?}, 

    function(data){

    });

});

I want to post the value associated with the radio button. but how do i select the value?
how do i determine what radio button is selected and POST it?