title: Get "src" from an iframe inside a unique div
body: <p>How is it possible here to get the "src" from the iframe that is inside the div "youtubeHolder"? What's happening in the code below is that it search for all id's starting with youtubeHolder. And there are multiple holders, that is dynamically created as youtubeHolder1, youtubeHolder2 etc.</p>
  
  <p>Any ideas?</p>
  
  <p>Jquery: </p>
  
  <pre><code>$(document).ready(function() {
  $('a#export').on('click',function(){
      var contentMap = {};
      $('[id^="youtubeHolder"]').each(function(){
          contentMap[this.id] = $(this).html();
          });
          for(id in contentMap) {
  
  $.ajax({
      url: "post.php",
      type: "post",
      data: { 
          ExportDivID: id,
          ExportDivContent: contentMap[id]
      },
      success: function(){
          alert("success");
      },
      error:function(){
          alert("failure");
      }   
      }); 
      }
      });
      });
  </code></pre>
  
  <p>Many thanks in advance!</p>