how to activate or use $FIRSTPOSTID in postbit_legacy?

[gmptp]

I'll like to use $FIRSTPOSTID in postbit_legacy, how can I copy and paste $FIRSTPOSTID from showthread and use it in postbit_legacy? What additional code do I need to put it in postbit_legacy in order to use the $FIRSTPOSTID?

--------------- Added [DATE]1313600587[/DATE] at [TIME]1313600587[/TIME] ---------------

or What is the code for the firstpostid in legacy_postbit?

below is the post id, but I want the 1st post id, what is the code for 1st post id?
"post$post[postid]"

--------------- Added [DATE]1313602264[/DATE] at [TIME]1313602264[/TIME] ---------------

found the solution

use:

$thread[firstpostid]