How to display the progress of a server script in jQuery?

function calculateTotals() {
    $('#results').load('getResults.php', null, showStatusFinished);
    showLoadStatus();
}

function showLoadStatus() {
    $('#status').html('');
}


function showStatusFinished() {
    $('#status').html('Finished.');
}

function getStatus() {
    $.getJSON("/status.php",{"session":0, "requestID":12345},
    function(data) { //data is the returned JSON object from the server {name:"value"}
          setStatus(data.status);
          window.setTimeout("getStatus()",intervalInMS)
    });
}

{"status":"We are done row 1040/45983459"}