Mouse wheel tilt actions?

[scarlion1]

I created ~/.config/feh/buttons with:

zoom_in 4
zoom_out 5

since it's documented.  That works well and can zoom in/out with the wheel.  Now I would like to assign the wheel tilt left/right for prev_img and next_img, but I couldn't figure what button numbers those are, do you know?  or, is there some query i can run on my mouse to find out the button numbers? Thanks

[Ferada]

Quick way is to run xev and press the buttons over that window, will print what events are happening on the console. I bet it's 6 and 7 though.