BuddyPress.org

Does anyone have pointers or can anyone tell me a short way to create a simple nag-bar (or better yet , dissipating growl-like popup) when users do not create an avatar ?

My site is filled with cute yellow smileys (default avatar), but I’d rather nudge users to use a picture.

(know my way around PHP, don’t want an overloaded plugin with extra features that “happens to have” the nag-feature – although if you know of one I may be able to pull the routine out).