javascript - creating a jquery custom lightbox setup. -

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i'm creating custom jquery lightbox.

the problem i'm having setup function doesn't work wanted to, wanted when image click want setup() function run , update variables (prev_img, next_img, count, current_img_src). when #next , #prev click want run setup function , update. 

    <ul id="items">         <li class="shrink"><img src="foo1.jpg" alt="foo1"/></li>         <li class="shrink"><img src="foo2.jpg" alt="foo2"/></li>         <li class="shrink"><img src="foo3.jpg" alt="foo3"/></li>         <li class="shrink"><img src="bar1.jpg" alt="bar1"/></li>         <li class="shrink"><img src="bar2.jpg" alt="bar2"/></li>         <li class="shrink"><img src="bar3.jpg" alt="bar3"/></li>     </ul>     <nav>         <span id="next">next</span><br/><span id="prev">prev</span>         </nav>

script

$(function(){     var prev_img, next_img, count, current_img_src = '';      $('.shrink img').on('click', function(e){                if(e.target.tagname == 'img'){             current_img_src = $(this).attr("src");             setup();         }     });     $('#next').click(function(){         console.log(next_img);         setup();     });     $('#prev').click(function(){         console.log(prev_img);         setup();     });      function setup(){        count = $('.shrink img').length;            $(".shrink img").each(function(){                     if($(this).attr("src").tostring() === current_img_src.tostring()){                 prev_img = $(this).prev();                 next_img = $(this).next();             }         });     } });


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