http://www.xulplanet.com/tutorials/xultu/stacks.html http://www.xulplanet.com/reference/elemref/ref_deck.html An element that displays only one of its children at a time. The selectedIndex attribute determines which child is displayed. Gets and sets the index of the currently selected panel in the deck. The first item is at index 0. Gets and sets the index of the currently selected panel in the deck. The first item is at index 0. A non-bubbling select event will be sent to the deck when the selected panel is changed. Holds a reference to the currently selected panel in the deck. Assign a value to this property to modify the selected panel. A non-bubbling select event will be sent to the deck when the selected panel is changed.