[Zope] How to change site_url

[Renier Leenders]

Hi there,

Due to a change in my server ipaddress I have to change the site_url
of my customized squishdot site.
By installatoin squishdot stores the variable site_url somewhere
It is not possible to change the site_url in the properties tag of
squishdot and I don't know how to change variables in the namespace.

Any suggestions will be greatly appreciated.

Renier