1. It will have to work on Facebook canvas in an iframe.
3. It must be compatible with swfobject, jquery and/or other well known libraries and not conflict with them. Custom JS is acceptable but to be avoided for things like embedding of the movieclip, again, for reasons of reliability.
4. There can be no scrollbars other than the main scrollbar which scrolls the browser window up and down.
I have made a rough example here http://www.qublix.com/widescreen/ - NOTE: this example does not meet the requirements. It just work somewhat properly but it is not done and does not work on Facebook as it should.
I can provide the sample swf but the size of the swf we will use is 1540x1000 pixels.
The final version will be tested in all modern browsers and if it does not work we will reject it. IE6 compatibility is not a must if that is a problem. In fact we don't care much for IE6.