lenny: how to use iceweasel, ie. x-www-browser from icedove?

[Johannes Wiedersich <johannes@physik.blm.tu-muenchen.de>]

On my newly installed lenny, icedove opens links with epiphany instead 
of my prefered iceweasel:

root@e13-v21:~# ll /etc/alternatives/ |grep x-www-browser
lrwxrwxrwx 1 root root  18 2008-02-23 22:40 x-www-browser -> 
/usr/bin/iceweasel
lrwxrwxrwx 1 root root  34 2008-02-23 22:40 x-www-browser.1.gz -> 
/usr/share/man/man1/iceweasel.1.gz

How to fix this?

Thanks,

Johannes