I need the same functionality, however I've paid for Simpleviewer-pro.
I'm just waiting for my download link for the most up to date version, then I will post a tutorial in the Simpleviewer-pro thread on how to do what you require. I've already done what we require with the source code in an earlier version, but obviously don't want to post about that as it's out of date.
To be perfectly honest, for the very modest fee of $40, guys, it's really worth paying for the pro version and customising it.
I can guarantee that what you require can be done...