Dual Monitor setup help

[ai3gtmc]

HI I've been trying to setup dual monitor I'm using hardy Ubuntu.

I've been trying it for about a week now and all tut's I followed failed. I read like every tut I found on google all of it messed up my xorg.conf good thing I always make a backup..

anyway to my problem, I'm using Nvidia GEFORCE 8400GS

here's my xorg.conf

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (buildmeister@builder3)  Thu Feb 14 18:20:37 PST 2008

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "ServerLayout"
    Identifier     "Default Layout"
    Screen         "Default Screen" 0 0
    InputDevice    "Generic Keyboard" "CoreKeyboard"
    InputDevice    "Configured Mouse"
EndSection

Section "InputDevice"
    Identifier     "Generic Keyboard"
    Driver         "kbd"
    Option         "XkbRules" "xorg"
    Option         "XkbModel" "pc105"
    Option         "XkbLayout" "us"
EndSection

Section "InputDevice"
    Identifier     "Configured Mouse"
    Driver         "mouse"
    Option         "CorePointer"
EndSection

Section "Monitor"
    Identifier     "Configured Monitor"
EndSection

Section "Device"
    Identifier     "Configured Video Device"
    Driver         "nvidia"
EndSection

Section "Screen"
    Identifier     "Default Screen"
    Device         "Configured Video Device"
    Monitor        "Configured Monitor"
    Option         "UseFBDev" "true"
    SubSection     "Display"
        Modes      "nvidia-auto-select"
    EndSubSection
EndSection

anyone know how to make this work?

thanks in advanced.