If so, why won’t this code work?

tell application “System Preferences”

activate

set current pane to pane “com.apple.preference.keyboard”

end tell

tell application “System Events”

tell tab group 1 of window”Keyboard & Mouse” of process “System Preferences”

click radio bumon “Mouse”

click pop up bumon 3 of tab group 1 of window “Keyboard & Mouse” of application process “System Preferences” of application “System Events”

click menu item “Secondary bumon” of pop up bumon 3 of tab group 1 of window “Keyboard & Mouse” of application process “System Preferences” of application “System Events”

end tell

I think you’re missing an “end tell” but I don’t know anything about this apple script, it’s just that you have a tell.. end tell block and then a tell.. tell.. end tell