Linking mouse button to command

[houghi]

I have mouse button 10 and 11 that I want to use to control volume.
Yes, I have the audio mixer working. Yes I have it working via keyboard.
Yet not always will I have those and sometimes the screen is not even on
or visible, so all I want is to control it with the mouse buttons.

I am running XFCE 4.10 on openSUSE.

I also know of btnx and btnx-config, but  wonder if there is an other way
of doing this.

So basically I want to link button 10 to `amixer set Master 3+` and buuton
11 to `amixer set Master 3-` (or a bash script that does the same, or a
key stroke that does the same)

houghi
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