binding back/forward to mouse buttons

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http://askubuntu.com – I have a basic logitech mouse with 5 buttons: left, right, wheel left, wheel, wheel right. I used to use wheel left and right for going back and forward in my browser or navigator. Now this doesn't work. I've found many solutions, people telling to install this program or that, didn't seem to work. Regards, Brent (HowTos)