javascript:history.back (2) ; doesn't work? Goes 1 step back!?

Answer 1

The correct form for the back option is
history.back()
This will go back one page.

There is also
history.forward()
This will go forward one page.

What you want is
history.go(-2)

You should first check that you can go back 2 pages though with
if (history.length > 1)

Answer 2

no, you are wrong
use this
javascript:history.go(-2)
note 2 points:
1/history.go not history.back
2/minus 2 not 2
See details at the link below