I've had my gallery for over a year now, and it's been working fine ever since, but just recently whenever you click on a thumbnail to view the full image, I get a screen that says this:
QuoteInternal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@milena-roucka.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
you can view the gallery here: http://www.milena-roucka.com/gallery (http://www.milena-roucka.com/gallery)
Update your gallery and check permissions on displayimage.php. If you still have the problem talk to your webhost.