Open the menu, and look at Common Preferences > Details > External commands > Web browser.

That'll need to point at a shell script along the lines of: http://maemo.org/pipermail/maemo-dev...ry/002403.html

Obviously at some point that should be all combined into the end-deb, but in the mean time, I don't see why that shouldn't work (although I've not tested it!)

HTH,

Andrew