Doug,
You need to modify the web.config file that is used by your application.
Case 1:
You have an application http://mysite.com/myGallery and myGallery is a virtual directory. You should find the web.config file under http://mysite.com/myGallery.
Case 2:
You have an application http://mysite.com/myGallery and myGallery is not a virtual directory, it's just a regular folder under the root. You should find the web.config file under http://mysite.com/
Hoep it helps.
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