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JQVMap.prototype.zoomOut = function () {
  var map = this;
  var sliderDelta = (jQuery('#zoom').innerHeight() - 6 * 2 - 15 * 2 - 3 * 2 - 7 - 6) / (this.zoomMaxStep - this.zoomCurStep);

  if (map.zoomCurStep > 1) {
    map.transX += (map.width / (map.scale / map.zoomStep) - map.width / map.scale) / 2;
    map.transY += (map.height / (map.scale / map.zoomStep) - map.height / map.scale) / 2;
    map.setScale(map.scale / map.zoomStep);
    map.zoomCurStep--;

    var $slider = jQuery('#zoomSlider');

    $slider.css('top', parseInt($slider.css('top'), 10) + sliderDelta);

    map.container.trigger('zoomOut');
  }
};