From Aml Pages:
Mouse Hunter is a free utility that optimizes the work with the mouse wheel. When you spin the mouse wheel it scrolls the UI element that is located under the mouse pointer, not the element that has the input focus (which responds to the keyboard input) as it usually happens in Windows.
It works with almost all applications.
It sits in your system tray as an icon.
Left-click on the icon to enable or disable the Mouse Hunter.
Double left-click on the icon to open settings.
Right-click on the icon to get the context menu.
In the settings you can enable horizontal scrolling when certain buttons are pressed.