function stopPropagation(event) {
  // ie8
  // http://msdn.microsoft.com/en-us/library/ie/ff975462(v=vs.85).aspx
  if (typeof event.stopPropagation === 'function') {
    event.stopPropagation();
  } else {
    event.cancelBubble = true;
  }
}
Prevent further propagation of the current event (prevent bubbling).

@param event {Event}