I'm running LXDE in Lubuntu 12.04 LTS on an old ASUS Eeepc 1005HA. When my mouse cursor is over the desktop, that is, not within the bounds of any open windows, scrolling the mouse wheel will switch to another desktop. I use two desktops frequently on this machine, and I have the number of desktops limited to two in the Openbox Configuration Manager.
Due to my mouse wheel's design, it's really easy to accidentally bump it and switch the desktop. How do I disable desktop switching using the mouse wheel? I've looked at the Linux LXDE Guide, the Keyboard and Mouse settings, and the Openbox Configuration Manager, but I can't find this particular setting.
tl;dr: see bold