Vertical/horizontal window tiling in Openbox

rc.xml

    <!-- Vertical tiling -->
    <keybind key="W-Right">
      <action name="UnmaximizeFull"/>
      <action name="MoveResizeTo">
        <width>50%</width>
      </action>
      <action name="MaximizeVert"/>
      <action name="MoveResizeTo">
        <x>50%</x>
        <y>0</y>
      </action>
    </keybind>
    <keybind key="W-Left">
      <action name="UnmaximizeFull"/>
      <action name="MoveResizeTo">
        <width>50%</width>
      </action>
      <action name="MaximizeVert"/>
      <action name="MoveResizeTo">
        <x>0</x>
        <y>0</y>
      </action>
    </keybind>
    <!-- Horizontal tiling -->
    <keybind key="W-Up">
      <action name="UnmaximizeFull"/>
      <action name="MoveResizeTo">
        <height>50%</height>
      </action>
      <action name="MaximizeHorz"/>
      <action name="MoveResizeTo">
        <x>0</x>
        <y>0</y>
      </action>      
    </keybind>
    <keybind key="W-Down">
      <action name="UnmaximizeFull"/>
      <action name="MoveResizeTo">
        <height>50%</height>
      </action>
      <action name="MaximizeHorz"/>
      <action name="MoveResizeTo">
        <x>0</x>
        <y>50%</y>
      </action>      
    </keybind>