/*jslint evil: true, browser: true, immed: true, passfail: true, undef: true, newcap: true*/
/*global easyXDM, window, escape, unescape, debug */
//
// easyXDM
// http://easyxdm.net/
// Copyright(c) 2009-2011, Øyvind Sean Kinsey, oyvind@kinsey.no.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

/**
 * @class easyXDM.stack.ReliableBehavior
 * This is a behavior that tries to make the underlying transport reliable by using acknowledgements.
 * @namespace easyXDM.stack
 * @constructor
 * @param {Object} config The behaviors configuration.
 */
easyXDM.stack.ReliableBehavior = function(config){
    // #ifdef debug
    var trace = debug.getTracer("easyXDM.stack.ReliableBehavior");
    trace("constructor");
    // #endif
    var pub, // the public interface
 callback; // the callback to execute when we have a confirmed success/failure
    var idOut = 0, idIn = 0, currentMessage = "";
    
    return (pub = {
        incoming: function(message, origin){
            // #ifdef debug
            trace("incoming: " + message);
            // #endif
            var indexOf = message.indexOf("_"), ack = message.substring(0, indexOf).split(",");
            message = message.substring(indexOf + 1);
            
            if (ack[0] == idOut) {
                // #ifdef debug
                trace("message delivered");
                // #endif
                currentMessage = "";
                if (callback) {
                    callback(true);
                }
            }
            if (message.length > 0) {
                // #ifdef debug
                trace("sending ack, and passing on " + message);
                // #endif
                pub.down.outgoing(ack[1] + "," + idOut + "_" + currentMessage, origin);
                if (idIn != ack[1]) {
                    idIn = ack[1];
                    pub.up.incoming(message, origin);
                }
            }
            
        },
        outgoing: function(message, origin, fn){
            currentMessage = message;
            callback = fn;
            pub.down.outgoing(idIn + "," + (++idOut) + "_" + message, origin);
        }
    });
};

@@ -2535,24 +2535,62 @@
 ack(true);%0D%0A
+                    callback = null;%0D%0A
             

clean previous callback to prevent unnecessary invoke