function pauseShow(button) {
  if (button.src=="http://www.nisd.net/slideshow/styles/themes/pause.png") {
    $('#images').cycle('pause');
    return 'http://www.nisd.net/slideshow/styles/themes/play.png';
  } else {
    $('#images').cycle('resume');
    return 'http://www.nisd.net/slideshow/styles/themes/pause.png';
  }
}