1. A method, comprising: arranging an information hierarchy including a set of selectable top-level elements, a dynamically-varying set of selectable mid-level elements which is dynamically selected based on a selection of one of said top level elements, and a displaying element; electing one of said top-level elements, and responsive to said selecting, changing the set of said mid-level elements that are displayed; enabling selection of any of the displayed mid-level elements; and displaying at least one graphic part associated with a selection.