javascript - Selecting an <iframe> inside of an <a> tag with jquery -


i have script display lightbox when thumbnail clicked, , worked pictures. realized needed videos, not pictures, though, , changes script don't seem working. how select iframe inside clicked anchor tag display video? html , jquery:

html

<div class="backdrop"></div> <div class="box">     <div class="close">x</div>     <img class="big_img" src="#"> </div>  <div class="container">     <ul class="body">          <li class="responsive">             <div class=image>                 <a href="#" class="lightbox"><img class="gallery thumbnail" src="../pics/placeholder.png"><iframe width="560" height="315" src="https://www.youtube.com/embed/uaq9-sl13zg" frameborder="0" allowfullscreen></iframe></a>                 <p>test</p>             </div>         </li>

jquery

<script type="text/javascript">     $(document).ready(function() {         $(".thumbnail").click(function() {             var video = $("iframe",this).attr("src");             $('.big_img').attr("src",video);             $('.backdrop, .box').animate({'opacity':'.50'}, 300, 'linear');             $('.box').animate({'opacity':'1'}, 300, 'linear');             $('.backdrop, .box').css('display', 'block');         });          $('.close').click(function(){             close_box();         });          $('.backdrop').click(function(){             close_box();         })     });      function close_box()     {         $('.backdrop, .box').animate({'opacity':'0'}, 300, 'linear', function(){                 $('.backdrop, .box').css('display', 'none');             });     } </script>


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