see http://www.pmwiki.org/wiki/Cookbook/HorizontalVerticalMenu

Available Markup (see also examples) (:hmenu:) begins a horizontal menu. Available options are up (opens the menu upwards) and left (open menu to the left). These options can be combined, e.g (:hmenu up left:). (:vmenu:) begins a vertical menu. Same options as with hmenu available. (:newmenu:) needed for separation of main menu items (mainly when using hmenu) (:emenu:) begin expanded menu. Availbale options are up (no floating) and left (text is written left of the menu)

menuitem (same as bullet list)

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separator line (should be placed after any submenues) (:menuend:) end the menu