[kde-linux] mapping middle mouse button to 'back' possible?

[hyperaesthetic]

Howdy,

Is mapping middle mouse button to 'backspace' possible? I am a linux noobie 
and looked at xmodmap, but it doesn't say I can map a keyboard value 
(backspace) to a button click.

I want to do this because that's how I set it up on my windows machine. I'd 
prefer this modification to be limited to firefox and konqueror, but that's 
not as important as getting it to work.

Thank you for your help.
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