Links broken after moving confluence to new server and url

Edit Subject

I am using Balsamiq for Confluence and I have changed the server url. The old url was like:

http://projects.mydomain.com/wiki

and the new url is like:

http://wiki.mydomain.com/

I have two problems now. First I when I try to create new links in Balsamiq it always adds a "/wiki/" to the link path. The result of course is that all new links are broken. The second problem is that I need to get the "/wiki/" context path out of all the attachments.

I am running all this on Ubuntu and am perfectly comfortable using Sed and Awk or other command line tools but I want to know the proper way to fix all this without breaking Confluence