it would appear that if you are not a memeber of the AHA, you would not be able to participate in the forum.
intended or not, it's clever.
if i were just visiting this site, i'd think i'd need to "join" before i could participate, which i would do and then i would find out that i need to "register", which would leave me scratching my head wondering why joining AHA didn't join me to the forum.
maybe if one banner was at the top and one at the bottom.