<div id="links" class="links">
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        <img src="https://farm1.static.flickr.com/938/42813532974_9e7c491f8f_s.jpg">
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    <a href="https://farm1.static.flickr.com/854/29656848268_6b4195e2f8_b.jpg" title="Osprey 7_20" data-gallery="">
        <img src="https://farm1.static.flickr.com/854/29656848268_6b4195e2f8_s.jpg">
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   <a href="https://farm1.static.flickr.com/852/28863381917_ba25919b70_b.jpg" title="bee eater" data-gallery="">
     <img src="https://farm1.static.flickr.com/852/28863381917_ba25919b70_s.jpg"></a>
    <a href="https://farm2.static.flickr.com/1772/43802753721_3809c7bb30_b.jpg" title="Desert Nights" data-gallery="">
      <img src="https://farm2.static.flickr.com/1772/43802753721_3809c7bb30_s.jpg"></a>
    <a href="https://farm2.static.flickr.com/1794/28868415067_caf8f1c13d_b.jpg" title="Lavanda Panoramica" data-gallery="">
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    <a href="https://farm1.static.flickr.com/938/29924735128_74779fc320_b.jpg" title="Viceroy Butterfly" data-gallery="">
      <img src="https://farm1.static.flickr.com/938/29924735128_74779fc320_s.jpg"></a>
    <a href="https://farm1.static.flickr.com/930/43807501201_c02bc0019d_b.jpg" title="Tellurium" data-gallery="">
      <img src="https://farm1.static.flickr.com/930/43807501201_c02bc0019d_s.jpg"></a>
    <a href="https://farm1.static.flickr.com/936/42905663835_3fe0c793da_b.jpg" title="Guillemots" data-gallery="">
      <img src="https://farm1.static.flickr.com/936/42905663835_3fe0c793da_s.jpg"></a>
    <a href="https://farm2.static.flickr.com/1820/43756964872_70b64f6a0f_b.jpg" title="Sturnelle des prés / Eastern Meadowlark" data-gallery="">
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    <a href="https://farm1.static.flickr.com/939/43803451851_09f6493161_b.jpg" title="" data-gallery="">
      <img src="https://farm1.static.flickr.com/939/43803451851_09f6493161_s.jpg"></a>
    <a href="https://farm2.static.flickr.com/1839/29937188458_40a4188447_b.jpg" title="Am AgrippinaUfer" data-gallery="">
      <img src="https://farm2.static.flickr.com/1839/29937188458_40a4188447_s.jpg"></a>
    <a href="https://farm2.static.flickr.com/1818/43798757251_b8bfd2db40_b.jpg" title="Apostroph . . . Semicolon . . ." data-gallery="">
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    <a href="https://farm2.static.flickr.com/1798/43748011402_b236c910b2_b.jpg" title="Summer Sunset" data-gallery="">
      <img src="https://farm2.static.flickr.com/1798/43748011402_b236c910b2_s.jpg"></a>
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      <img src="https://farm1.static.flickr.com/853/29928898708_e0b1d18e8b_s.jpg"></a>
</div>

<div id="blueimp-gallery" class="blueimp-gallery blueimp-gallery-controls">
    <div class="slides"></div>
    <h3 class="title"></h3>
    <a class="prev">‹</a>
    <a class="next">›</a>
    <a class="close">×</a>
    <a class="play-pause"></a>
    <ol class="indicator"></ol>
</div>

.blueimp-gallery > .indicator > li {
  display: inline-block;
  width: 50px;
  height: 50px;
  margin: 6px 3px 0 3px;
  -webkit-box-sizing: content-box;
     -moz-box-sizing: content-box;
          box-sizing: content-box;
  border: 1px solid transparent;
  background: #ccc;
  background: rgba(255, 255, 255, 0.25) center no-repeat;
  border-radius: 2px;
  box-shadow: 0 0 2px #000;
  opacity: 0.5;
  cursor: pointer;
}
.blueimp-gallery>.indicator{
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    -ms-overflow-style: -ms-autohiding-scrollbar;
}

document.getElementById('links').onclick = function (event) {
  event = event || window.event;
  var target = event.target || event.srcElement,
      link = target.src ? target.parentNode : target,
      options = { index: link, event: event },
      links = this.getElementsByTagName('a');
  // blueimp.Gallery(links, options);
  var gallery = blueimp.Gallery(
      links,
      {
      index: link, event: event,
      onopen: function () {
          // Callback function executed when the Gallery is initialized.
      },
      onopened: function () {
          // Callback function executed when the Gallery has been initialized
          // and the initialization transition has been completed.
      },
      onslide: function (index, slide) {
          //console.log("onslide:"+index);
          // Callback function executed on slide change.
          var get_index = index+1;
          var get_w = $('.indicator').width();
          var get_item_num = Math.floor(get_w/52)-1;
           var page_index =  Math.floor(get_index/get_item_num);
          console.log("onslideend:"+get_index+"/"+get_w+"num:"+get_item_num+"page:"+page_index);
          $('.indicator').scrollLeft(page_index*get_w);
      },
      onslideend: function (index, slide) {
          var get_index = index+1;
          var get_w = $('.indicator').width();
          var get_item_num = Math.floor(get_w/52);
          var page_index =  Math.floor(get_index/get_item_num);
          console.log("onslideend:"+get_index+"/"+get_w+"num:"+get_item_num+"page:"+page_index);
          $('.indicator').scrollLeft(page_index*get_w);
          // Callback function executed after the slide change transition.
      },
      onslidecomplete: function (index, slide) {
          // Callback function executed on slide content load.
      },
      onclose: function () {
          // Callback function executed when the Gallery is about to be closed.
      },
      onclosed: function () {
          // Callback function executed when the Gallery has been closed
          // and the closing transition has been completed.
      }
      }
  );
};