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$.fn.scrollTo = function (target, options, callback) {
  if (typeof options === 'function' && arguments.length == 2) {
    callback = options
    options = target
  }
  var settings = $.extend({
    scrollTarget: target,
    offsetTop: 50,
    duration: 500,
    easing: 'swing'
  }, options)
  return this.each(function () {
    var scrollPane = $(this)
    var scrollTarget = (typeof settings.scrollTarget === 'number') ? settings.scrollTarget : $(settings.scrollTarget)
    var scrollY = (typeof scrollTarget === 'number') ? scrollTarget : scrollTarget.offset().top + scrollPane.scrollTop() - parseInt(settings.offsetTop)
    scrollPane.animate({ scrollTop: scrollY }, parseInt(settings.duration), settings.easing, function () {
      if (typeof callback === 'function') {
        callback.call(this)
      }
    })
  })
}