I installed Multiple Image Upload. After I select images to upload, no preview images are shown but the status bar screen opens and the program freezes. Eventually an error pops up saying: "A script in this movie is causing Flash Player 9 to run slowly. Do you want to abort?" Selecting no does nothing.
Here's a test page: http://www.hylandbayrealty.com/adminsite/test.php
Thanks Gunter for referring the article but I think I discovered the problem. I installed the program using a different host and it seems to work. Apparently the first host doesn't allow Flash programs to upload files for security purposes.