Hello,
This is Shamzi here from Bangalore, India. Hope you're doing very well.
I happened to see the project you have posted here. I would like to offer my help to you, in debugging the Javascript Callback issue you are facing. I believe it should be straight forward, but I can give a better analysis only after knowing more details, hope you understand that.
A brief summary of my skill-set:
I'm a passionate Web Applications and Browser extensions developer. In my 7+ years of work experience in this field, I have gained sound knowledge on various web technologies (Javascript, Ajax, jQuery, HTML5, CSS3, Python, Django, Node.js).
Just ping me on chat and we can discuss further on it. Thanks for reading through my bid.
Cheers,
Shamzi