i tried to insert a module, and paste the code in that module, and it works!
wonderful!
john, you are my idol!!!
thank you very much.

and i find something more to solve, but it's not very important now, the problem is:
if slide2 with flash is not played to it's end, and we click to slide3, then when we slide show again from slide1, the flash will be played from where it's stopped , not from the flash's first frame.