Google Chat back

I’ve been using Google chat back on this website, it’s a nice way to let people get in touch with me, but every time someone engages in conversation with me, chat back notifies my via gtalk, but conversation doesn’t start right away, you need to open a browser page to enter the conversation! I don’t get this at all, if chat back is using gtalk to notify me why doesn’t the conversation continue in that window?
Adding to this, because I’m using Vista at work, gtalk opens IE7 even though it’s not my default web browser… errr!