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// ms = 1000 / fps
// 1000 / 40(fps) = 25(ms)
var timeMs = 25;

setTimeout("moveButton",timeMs);

function moveButton()
{
      displayAnimation();
      setTimeout("moveButton",timeMs);
}

var timeMs = 25;
start();

function moveButton()
{
      if ( ! looping ) return;

      displayAnimation();

      setTimeout("moveButton",timeMs);
}

function start()
{
      if ( looping ) return;
      setTimeout("moveButton",timeMs);
      looping = true;
}

function stop()
{
      if ( ! looping ) return;
      looping = false;
}