Lol Guys, if it was a post exploit then it would happen for everyone in the same thread all the time because only client side code could be executed, and in this case when it is executed only one line of code shows up therefore eliminating the possibility of a client side code timer/if statement.
Therefore I re-itereate, it has to be server side code that looks at the forum number, and then checks the time or mid and then decides if it is going to insert the magical 'GFY again'. Sorry to burst your bubble on the exploit theory.
However, I would like to add Chtu, your 'Fix this' popup proves my theory. I get that one everytime I reload with your code.
edit:addition
Edited, Fri Jan 21 12:35:58 2005 by ElderonXI