action is controlled by e.g. waterIndex

makeToggleButton() calls are in controls.js

doToggleButton(xxxIndex) is in jcontrol.js

toggleIsDown[slabIndex] is state of buttons in all control panels for that index.

setButtonState("down", slabIndex) [jcontrol.js] changes gif images for all control panels.
	It uses set1ButtonState(state, ibutt#)
Note: showHelp(make...Help()) automatically sets helpPanel to "make...Help()".

doMolViewSpt() is skipped in FG3.1 for spin, bkg, slab and if viewHasThinBackbone: quality.

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ZOOM buttons are handeled by doZoom('-'/'') // not '+'. In top.js.