Just a tip: Before your colleague gets started with the migration, ask
him to
use Sahi (http://sahi.sourceforge.net/)to record the app's behaviour in
IE.
Then as they port the pages to FF/Safari, they could run Sahi tests to
ensure
that the application behaves as on Windows.
Sahi looks like some seriously helpful stuff. Thanks for letting us know this tool.
Harshal.