Just found this tutorial, can't bother to copy and paste it (since i can't get the code...) meh. I'll leave it here.
I've tried it out myself, and it does work.
How it can look like:
Yes, idk what's up with the bold text but blame it on Voltaic since he's been messing around with my postbit >_<
(I made it into text instead of images, though)
Sorry, but you need at least 25 posts and 5 hours online time to unlock hidden content.