Ok, I've posted the new script here.
It is filled with 2 Kb of code and about 5Kb of explanation.
http://home.wanadoo.nl/r.s.m.s.dejong/Kixscripts.htm

If you want more info about the IP-calculation, you should take a look at http://home.wanadoo.nl/r.s.m.s.dejong/Scripts/mgroups.doc

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Greetz,

Roger the Young
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The code is out there...
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The Code is out there