I put your function in lib_local.php or mod/forum and attach it here ...
perhaps Martin can advise us which of the following he would prefer us to upload such development code:
- here as attachments to postings
- in the bug report system as attachments to feedback
- in cvs contrib
- in cvs mod/forum as lib_local.php
warning: this code is very alpha, and is intended for developers only ... instructions for use are too cryptic