Joomla+vbulletin wrapped (how to change forum's urls?)

[sickboy6ths]

How can I implement this kind of rewrite rule without looping?

With looping I mean:
You request a page at vBulletin forum, url gets rewritten to use the wrapper, but the wrapper also requets page at vBulletin forum, so it's looping

Hope this wasnt too confusing
Thanks for any insight

Some more info posted elsewhere

Hi Im using e.g:
RewriteRule ^vbulletin/(.*)$ /index.php?option=com_jfusion&wrap=$1 [L,QSA]

But this creates a loop when viewing vbulletin pages through the wrapper.
You kinda get wrapper into wrapper into wrapper, because the wrapper also accesses the same vBulletin urls (which get rewritten).

Anyone able to help me to get the joomla wrapper url in the addressbar in browser, while retaining the dynamic url of the page ur viewing, e.g: showthread.php?t=555