<% LayoutImageMgr.navigation %>
render additional navigation if the parent of a layout also contains images

Sourcecode in LayoutImageMgr/macros.js:
1:   function navigation_macro(param) {
2:      if (!this._parent.parent || !this._parent.parent.images.size())
3:         return;
4:      this.renderSkin(param.skin ? param.skin : "navigation");
5:      return;
6:   }