[Ether]

Two different ways to turn a momentary-contact button into a toggle:

if ( buttonIsPressed() )              // test button state
    {
    if (!buttonWasPressed) toggle();  // toggle if state changed from "not pressed" to "pressed"
    buttonWasPressed=1;               // remember button state for next iteration
    }
else buttonWasPressed=0;              // remember button state for next iteration

I like this one better:

IsPressed = buttonIsPressed();          // get new button state

if (IsPressed && !WasPressed) toggle(); // toggle if state changed from "not pressed" to "pressed"

WasPressed=IsPressed;                   // remember button state for next iteration