Hi Howard,
Have you taken a look in the "C:\Program Files\Vizard20\tutorial\textures" directory. There are two sample scripts that show how to use an mpg video file and texture swapping. Also, if you are saying that a texture file is being changed during the program you can perform the "load" command on a texture. This will change the image file associated with that texture. Take a look at the Command Reference in the documentation under Multimedia:Image for more information on the "load" command.
Also, don't forget that you can add textures at any time in your program, not just at startup. Hope this helps!
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