Installing Python2.6 on Mac Os (Leopard)

[Massi]

Hi everyone, I'm trying to install Python2.6 on my mac (Leopard
10.5.5), but I'm encountering some problems. To install the package I
followed the instructions I found at this link:
http://wiki.python.org/moin/MacPython/Leopard
If I open wing, it turns out that the installed version is actually
2.6, but if i run python from terminal it displays version 2.5.1, that
is the default version for leopard. Furthermore I can't launch idle.
I'm pretty new to mac os environment so forgive me if my questions are
silly. Any hint?