I don't wait for the onload event to fire before I call the Dynarch setup call -- I do it inline after the elements are defined so that there isn't page jumping while the browser deals the change in height and width. Since the script is loaded first, DynarchMenu should already be defined. Yet, about 5% of the time I get the error. Its driving me nuts. And it only seems to be happening in FF2. http://v3.network54.com/