This is straght from the top....I just got nailed about this very thing. .from Lethal:
We don't allow avatars or sig graphics here, period. They are disabled completely. You might as well remove the one you were attempting from your sig because it will never work.
Attempts to post a "sig graphic" in the body of every post in an effort to circumvent the rules will result in (A) a stern warning not to do so again, then (B) revocation of your posting privileges if you persist.