The [Old] tag that I added doesn't mean this was already answered, it means your version of ioBanana is too old. I consider it to be obsolete and will soon start to close such topics.
A quick search gave me this:
http://www.inicom.net/forum/showthread.php?t=14452
I have no idea if it's working or not. However, I know that you'll lack several features like the messages sent when the requests are filled, your name in the "requester" field (it'll be the sitebot), etc.
This feature has been added to ioB2 without these limitations by the way... but I wonder why I bother to mention it as (apparently) everybody wants to get fixes for the obsolete versions instead of using newer versions that already have these.