(function($) {
var ajax = $.ajax;
var pendingRequests = {};
var synced = [];
var syncedData = [];
$.ajax = function(settings) {
settings = jQuery.extend(settings, jQuery.extend({}, jQuery.ajaxSettings, settings));
var port = settings.port;
switch(settings.mode) {
case "abort": 
    if ( pendingRequests[port] ) {
        pendingRequests[port].abort();
    }
    return pendingRequests[port] = ajax.apply(this, arguments);
case "queue": 
    var _old = settings.complete;
    settings.complete = function(){
        if ( _old )
            _old.apply( this, arguments );
        jQuery([ajax]).dequeue("ajax" + port );;
    };
    jQuery([ ajax ]).queue("ajax" + port, function(){
        ajax( settings );
    });
    return;
case "sync":
    var pos = synced.length;
    synced[ pos ] = {
        error: settings.error,
        success: settings.success,
        complete: settings.complete,
        done: false
    };
    syncedData[ pos ] = {
        error: [],
        success: [],
        complete: []
    };
    settings.error = function(){ syncedData[ pos ].error = arguments; };
    settings.success = function(){ syncedData[ pos ].success = arguments; };
    settings.complete = function(){
        syncedData[ pos ].complete = arguments;
        synced[ pos ].done = true;
        if ( pos == 0 || !synced[ pos-1 ] )
            for ( var i = pos; i < synced.length && synced[i].done; i++ ) {
                if ( synced[i].error ) synced[i].error.apply( jQuery, syncedData[i].error );
                if ( synced[i].success ) synced[i].success.apply( jQuery, syncedData[i].success );
                if ( synced[i].complete ) synced[i].complete.apply( jQuery, syncedData[i].complete );
                synced[i] = null;
                syncedData[i] = null;
            }
    };
}
return ajax.apply(this, arguments);
};
})(jQuery);