Opening a browser window from iBooks

Is it possible to have a link to a website in an ibook author textbook but instead of dumping you out of ibooks into Safari, it opens up a browser window within iBooks? I don't want to have the user to leave the iBook just to check out a website for a minute.

I know I've seen apps that will overlay a browser window which you can then close, keeping you in the app the entire time.

Thanks,

Paul