While changing from 6.4 to 6.5 some style elements was removed:

.alternatetable
.new
.onbody
.welcome

I search the scripts and fond used definations for onbody in:
doclosethreads.php
doexpirethreads.php
dokeepthreads.php
domovepost.php
domovethreads.php
doopenthreads.php
dounkeepthreads.php
stickpost.php
unstickpost.php

I search the scripts and fond used definations for welcome in:
login.tmpl

my board: http://www.dragonclan-forum.de
my hobby: http://www.biker-reise.de
Ich kann bei Fragen zu UBBthreads in Deutsch weiterhelfen oder es zumindest versuchen