Has anyone set up a wiki for making collaborative translations from one language to another?

Ideally, I'd like something like traduwiki.org, but I'd prefer something based on MediaWiki instead of pmWiki that traduwiki is based on.

It is trivial to set up a wiki with the text to be translated on one page, and the result on another (or on a subpage).

The difficulty comes when the source and result are side by side.

I have seen one solution -- putting the source document into the page as an image. But this is also less than ideal, IMO.

Does anyone have suggestions for how to set this up, or know of extensions that would be useful for this?

Kent