[TYPO3] Dynamic Menu

[Dan Osipov]

I'm reposting this question:

I am trying to create a menu, based on the pid passed in a URL variable. 
The menu should be generated starting from that pid. I've tried various 
variations of the code below, but it is always generating a menu from 
the page pid, not the value of the variable.

Here is the code:
     marks.BREADCRUMBS.special = rootline
     marks.BREADCRUMBS.special.value.data = GP: tx_ttnews|backPid
     marks.BREADCRUMBS.special.range = 0
     marks.BREADCRUMBS.1 = TMENU
     marks.BREADCRUMBS.1 {
         # Do stuff
     }

The value of tx_ttnews[backPid] is completely ignored...
Can someone point me to a mistake?
-- 
Dan Osipov
Calkins Media
http://danosipov.com/blog/