Javascript/jquery drag and drop UI + saving into XML

Hi, I would like a simple JS script (and its acompanying HTML) for a drag and drop UI. The UI will be used to create call flow and saving that result into XML. Your script should also be able to read the saved XML incase user might edit it. There is an opensource example of this which you can copy. Check out OpenVBX's ([login to view URL]) call flow editor. The only reason I do not use it is because its code is complicated and not well commented. There also will be some changes from the OpenVBX's implementation (which makes it even simpler).