Browser's "back-button", solved?

http://backtrack.tm5150.com/

backTRACK™ v2.0 seems to work - and the price seems to be 100$, what do u think?

Haven’t been able to find good working tut’s on this issue, but are pleased that it’s getting
closer, since I still find it very important.

Several sites are doing nice stuff: http://www.orange-project.com