[throwaway22832]

Uh... The back button IS the natural way to do it. I commend the OP for making the back button actually work how it's suppsoed to!

[tachyonbeam]

I'm not saying the back button shouldn't work. I'm saying it would be nice to have a way to do it from the webapp's UI as well.

[smexy]

Agreed. At this point people have been conditioned to expect the back button to lose their place or take them off the domain. So it's important to have a way in the webapp's UI even if you have the back button behaving properly.