Dual Boot Ubuntu and BT2

[oozypal]

I am trying to do dual boot in my laptop. I have 80GB in a Toshiba Satellite Duo Centrino.

I found this wiki but it too un-detailed.

backtrack.offensive-security.com/index.php?title=Howto:Dual_Boot_Backtrack_and_Ubuntu

Can someone help me on how do dual boot (Ubuntu and BT2)

What I don't understand about the wiki is: the wiki says

     {Ubuntu}------------hda1
     {Swap}--------------hda2
     {DOS(if you wish)}--hda3
     {Backtrack}---------hda4

in my laptop I have the following info which I got from qtparted

disk=/dev/sda
Partitions are sda1, sda2(extended) and sda5(swap)

in the wiki the swap is hda2 (in my case may be sda2). Is this Ubuntu swap or BT2 swap?

[Eristic]

Both OS's can use the swap, they don't need their own swap file.