Using DPKG to install deb packages

[kepler]

Dear friends,

I managed to download a newer version of Gcc, that dependes of a
glibc-cross, that depends of binutils.
I tryed to install them with the commands ( by order of dependency ):

dpkg -i binutils-version.deb
dpkg -i libc-cross-version.deb
dpkg -i gcc-version.deb

At the first sight it seemed that Debian installed something, or at least
changed something; but when I typed "gcc -v", it tells me that I still got
the older version of Gcc (2.95.4).
What did I do wrong? How can I install correctly the Debian packages?
I've tryed to re-install again; here's the result for binutils:


(Reading database ... 17033 files and directories currently installed.)
Preparing to replace binutils-x86-64 2.15-1 (using binutils-x86-64_2.15-1_i386.deb) ...
Unpacking replacement binutils-x86-64 ...
Setting up binutils-x86-64 (2.15-1) ...


Please answer as soon as possible.

Regards,

Kepler