General,
It is hard to tell but it looks like your Mouse Configuration is a 7 button and not a 4 button, am I right? if so you will need to follow this
if it is a four button mouse, or the below configuation doesn't work then you will need to find the corrrect configuration Here:
http://gentoo-wiki.com/HOWTO_Mouse_Nav_Buttons
First, you need to change your XF86Config file to use a newer protocol called ExplorerPS/2. You also need to tell the mouse driver that there are now seven buttons in total (left, middle, right, wheelup, wheeldown, and, depending on your mouse, side-left and side-right or thumb-forward and thumb-back). You must also tell it to map the ZAxisMapping to buttons 6 and 7, NOT 4 and 5.
Note: Depending on your hardware, the Device location might change. It could also be /dev/input/mice
Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/mouse"
Option "Buttons" "7"
Option "ZAxisMapping" "6 7"
EndSection
again if you are finding no joy with that try switching the "emulate 3D buttons" to false
That is all my Expertese on this subject I'm Afraid
Jake