PHP, MySQL and Flash

Does anyone know of any articles on integrating PHP, MySQL and Flash to perform a drag and drop routine for updating a db? Specifically, I have a client who is _INSISTING_ that I integrate a drag and drop feature into his railcar storage application. He wants to be able to view two railcar storage tracks, Track A and Track B, then drag and drop cars from Track A to Track B ( or Track B to Track A ). Once he positions ( orders ) all the cars properly on each track, I need to update a MySQL db to reflect the changes. I have already developed the above feature so that he can do this 'textually', but he is _determined_ that he must have the graphic 'drag and drop' feature. There may be another method ( Javascript ? ) to accomplish the same effect. I am certainly open to any advice and/or opinions. Any pointers would be _greatly_ appreciated. Thanks, Randy Rankin