Numbers in this line "if (_root._xmouse > 400) {" depends of widht of your flash movie. It should be 100 less that width of your movie. If flash document is 400*400 it should be 300.
13. Selct picture on Layer 1 and set instance name: photos
14. We are done. Test your movie
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5. If you have some questions about this tutorial, please contact me: chumpitas@gmail.com