jquery 1.5 ajax

ajax.js

function getJSONObject(url, params, ajaxCallBack, ajaxErrorHandler, excludeProgress){
    var e = (ajaxErrorHandler) ? ajaxErrorHandler : validationErrorCallBack;
    var s = (ajaxCallBack) ? ajaxCallBack : jsonCallBack;
    if (!excludeProgress)
        $('#working').show();
    $.ajax({
        type: "POST",
        url: url,
        cache: false, 
        data: params,
        beforeSend: function(xhr) {
            xhr.setRequestHeader("Ajax", "true");
            xhr.setRequestHeader("UseAjaxError", "true");
        },
        complete: function() {
            if (!excludeProgress) {
                stopWorking();
                $('#working').hide();
            }
        },
        success: s,
        timeout: _ajaxTimeOut,
        dataType: "text json",
        jsonp: null,
	    jsonpCallback: null,
        error: e
    });
}