var windowHeight, windowWidth;
  var fullHeight, scrollHeight;
  var streetImgWidth = 1024, streetImgHeight = 640;
  calculateDimensions();
  
  var currentPosition = -1, targetPosition = 0;
  var $$videoContainer = $('.street-view');
  var video = $('.street-view > video')[0];
  var hotspotElements = $('[data-position]');