Assigning middle button to left scroll, Logitech M505

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http://askubuntu.com – I have a Logitech m505 mouse, which works fine with my ubuntu 12.04. However, the middle button is so hard to press down that in windows I had assigned it to left scroll with the logitech driver. So if I was to open a link in a new tab, I'd pull the scroll button to the left. (I should also note that the mouse I have has a middle button that scrolls up and down, can be pressed down, and also can be "pulled" to left and right). Can I do this with xbindkeys, for instance? I think I know all the info that I need about the mouse: numbers of buttons, device name, etc. I'd appreciate if you co (HowTos)