jquery async callback manager

gistfile1.txt

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
    if (window.myCode == undefined) window.myCode = function () { }

    myCode.asyncManager = function () {
    }

    myCode.asyncManager.prototype = {
        waitingOn: 0,
        waitingFor: new Array(),
        waitFor: function (cont) {
            this.waitingOn++;
            this.waitingFor.push(cont);
        },
        signalDone: function () {
            if (this.waitingOn > 0) {
                this.waitingOn--;
            }
            if (this.waitingOn == 0) {
                this.whenAllDoneCallBack();
            }
        },
        whenAllDoneCallBack: function () { },
        whenAllDone: function (callback) {
            this.whenAllDoneCallBack = callback;
            for (var i in this.waitingFor) {
                this.waitingFor[i]();
            }
        }
    }

    $(function () {
        var m = new myCode.asyncManager();

        m.waitFor(function () {
            $.ajax({
                url: '',
                success: m.signalDone()
            });
        });

        m.waitFor(function () {
            $.ajax({
                url: '',
                success: m.signalDone()
            });
        });

        m.whenAllDone(function () {
            alert("i will display when all callbacks are done");
        });
    });       
</script>