External content?

I see in the screenshots that one can open external content in a lightbox, but I don’t see how to do this anywhere.

Also, I’m not looking to simply open an iframe, but something more complex, specifically a WalkScore map. (It’s a javascript widget.) Is that possible with this plugin?

If not, can anyone recommend a plugin that would work for this?

Thanks!

http://ww.wp.xz.cn/extend/plugins/lightbox-plus/