External Link Prefix
When a link to an external site is created, it can be run through a program that checks to see if the link is valid. If the link checks out OK, the visitor is redirected to the site. If the link check bad, the visitor is redirected to an error page that has a description of the error and a direct link to the site in question.
To use this link checking, enter 'load.php?site=' in the "_external_links" entry in the system configuration. To avoid using link checking, leave this entry empty.
This entry should not contain any spaces.