Create screenshotbutton

Before using you need to get the command 'import'  working
apt-get install graphicsmagick-imagemagick-compat

http://www.gentoo-wiki.info/TIP_Make_a_Screenshot_with_PrintScreen_Key



xmodmap -e "keycode 220 = F13"
Then save the config:
xmodmap -pke > .Xmodmap

~/.config/openbox/lubuntu-rc.xml

<keybind key="F13">
  <action name="Execute"><execute>/usr/bin/screenshot scr</execute></action>
</keybind>