Error Message URL

Hi guys!

We need to find a way to show the system messages on a different url than the site’s base url.

We tried using Brian Litzinger’s addon “Custom System Messages” which, according to this http://ellislab.com/forums/viewthread/209711/ should be able to change the url, but either it’s not working or we’re missing something.

Is there anything we can do to show system messages in a url lke http://mydomain.com/system_message? Even a simple url parameter would be enough (”?error”).

Any ideas? We could really use your help.

Best, Santiago