Like the first responce said, You're going to have to read the information the site sends to the browser and software. His suggestions are a good starting point.

BTW I'd be more than a little worried about a poker site that lets people observe what cards are being dealt. Why couldn't I play at the highstakes table and have my friend observe and IM me what cards the other players have? Of course I don't trust any gambling place (online or even face-to-face in Atlantic City or Las Vegas).