amroth, sorry for the late answer, but I see you have fixed that error.
I recommend you to change the background and font color of your submenu

ABOUT :

##############################################################
## Title: Forumlist in Menu for Board3
## Author: Darkheart, http://ankh.id.lv
## Description: Adds a forumlist to your Board3 portal menu with Categories in main menu and Forums in submenu.
## JavaScript code part based on ...