How to change Icedove default browser?

[Dennis Wicks <wix@mgssub.com>]

Greetings;

Icedove is using the Gnome(?) browser and I want to use 
Iceweasel.

I found a post from 2007 that said to use 
"update-alternatives --config x-www-browser"
but although that "worked" it didn't work, even though I 
bounced Icedove.

And I can't find any thing about wihich browser Icedove uses 
in any of the preferences or about:config.

Anybody know the answer?

BTW: Icedove=2.0.0.17 running on Lenny

TIA!
Dennis