Pager: size=_original link issue

When viewing an image that has an original image link on the image itself, acidfree will take the client to the larger original image.
The issue is that the pager now lists all the pages as original links and cause clients to receive a page not found.

E.e.: http://domain-url/content/imagename?size=_original

All of the pager links change from the page that has the original image being displayed in an Acidfree album:

http://domain-url/content/imagename to http://domain-url/content/imagename?size=_original

Any ideas how to correct this?

IIS6
Drupal 5.12
clean urls

rewrite rules:

# Accept a url with the following directories and pass them through unchanged.
RewriteRule ^/misc/(.*)$ /misc/$1 [I,L]
RewriteRule ^/files/(.*)$ /files/$1 [I,L]
RewriteRule ^/modules/(.*)$ /modules/$1 [I,L]
RewriteRule ^/themes/(.*)$ /themes/$1 [I,L]
RewriteRule ^/sites/(.*)$ /sites/$1 [I,L]
RewriteRule ^/uploads/(.*)$ /uploads/$1 [I,L]
RewriteRule ^/css/(.*)$ /css/$1 [I,L]
RewriteRule ^/images/(.*)$ /images/$1 [I,L]

# for modules that provide their own js (tinymce,img assist etc)
RewriteRule ^(.*\.js)$ $1 [I,L]
RewriteRule ^(.*\.gif)$ $1 [I,L]
RewriteRule ^(.*\.png)$ $1 [I,L]
RewriteRule ^/modules/tinymce/(.*)$ /modules/tinymce/$1 [I,L]

# Make URLs sane
RewriteRule ^/cron\.php$ /cron.php [I,L]
RewriteRule /index.php.* $0 [I,L]
RewriteRule ^/index\.php\?q\=(.*)$ /index.php?q=$1 [I,L]
RewriteRule ^/update\.php\?op\=(.*)$ /update.php?op=$1 [I,L]
RewriteRule ^/update\.php /update.php [I,L]
RewriteRule ^/xmlrpc\.php /xmlrpc.php [I,L]

RewriteRule ^/robots\.txt /robots.txt [I,L]

# Handle query strings on the end
RewriteRule /index.php.* $0 [I,L]
RewriteRule /(.*)\?(.*) /index.php\?q=$1&$2 [I,L]

# now pass through to the generic handler
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule /(.*) /index.php\?q=$1 [I,L]