for starters there is no longer a sun java
sun no longewr exists
Oracle bought then out
and that link is to a very old version
and
the current bt is bt5 r2
and the tutorials are for the old bt4
Backtrack IS designed for VERY VERY EXPERIENCED "white hat" system crackers and network SECURITY administrators
not for the " never used Linux before " person
use the manual install instructions ON Oracles web site
http://www.java.com
http://www.java.com/en/download/help...64_install.xml
-- however ---
if you are not able to install java than you might NOT want to use BT
please install something designed with the NEW USER in mind
like
Ubuntu 12
or
LinuxMint