A warning: Something about your poll - it seems that it will just continue as it was, but there is a chance that it will restart from zero, so take your decision about it. You can still try to remove the evil </div> yourself.
OK, if you got here then you probably want to perform the magic. So, the instructions are simple: Go to your message wall greeting code, delete everything, and type the magic spell:
Then hit PUBLISH.
The fixed code will magically find it's way to your wall, as you will see if you re-open the code.