PHP + JQUERY + AJAX

PHP + JQUERY + AJAX


Hi Guys,
I have a problem with JQUERY and AJAX. I would suggest you go to this
page and click on the next link.
http://test.zahidchaudhry.com/
Notice that the progress bars disappear after AJAX is invoked...
This is the AJAX function:
function ajaxFunction(ajax){
    try{
        // Opera 8.0+, Firefox, Safari
        ajaxRequest = new XMLHttpRequest();
    } catch (e){
        // Internet Explorer Browsers
        try{
            ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
        try{
            ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e){
            // Something went wrong
            alert("Your browser broke!");
                return false;
            }
        }
    }
    // Create a function that will receive data sent from the server
    ajaxRequest.onreadystatechange = function(){
        if(ajaxRequest.readyState == 4){
        var ajaxDisplay = document.getElementById('ReviewBox');
        ajaxDisplay.innerHTML = ajaxRequest.responseText;
        }
    }
    var queryString = "?review=" + ajax;
    ajaxRequest.open("GET", "../includes/ajax/review_ajax.php" +
queryString, true);
    ajaxRequest.send(null);
    //alert(queryString);
}
Any thoughts why this happens lads?
Cheers - Zahid