I would like to make the support a bit more general this, allowing for links such as:
[/page page]
How about using an interwiki link? Go to your mySQL prompt and type: INSERT INTO mywiki_interwiki (iw_prefix, iw_url) VALUES ('other', '../myOldSite/$1');
Then when you want to link to the other site you do: [[other:link.html|Click Me!]]