Wifi Button hotkey

edit 
/home/user/.config/openbox/lubuntu-rc.xml

<keybind key="F13">
  <action name="Execute"><execute>/usr/bin/screenshot scr</execute></action>
</keybind>

add another line in the keyboard binding for F16 (or whatever you want to use)

xmodmap -e "keycode 246 = F16"
xmodmap -pke > .Xmodmap