Re: Java 64-bit install (SOLVED)
I assume you're using Ubuntu, or some other Debian-based distribution. Unfortunately I can only talk about Debian, but things could be "close enough".
Installing software outside package management can be considered harmful. First of all there's no centralised method of keeping those components up to date, and second, there is no guarantee that they won't conflict with applications/libraries/whatever installed through package management. In short, don't do it. Don't do it unless you know what you're doing.
On Debian "make-jpkg" can be used to build number of Java distribution packages into Debian packages. Java plugin might also be available in the repository; just check your favourite package manager front-end.
Christianity, noun: The belief that a cosmic Jewish Zombie who was his own father can make you live forever if you symbolically eat his flesh and telepathically tell him you accept him as your master, so he can remove an evil force from your soul that is present in humanity because a rib-woman was convinced by a talking snake to eat from a magical tree. [mad.frog]