<script>
   var iframes = document.querySelectorAll('iframe');
   for(var i = 0; i < iframes.length; i++) {

      var parent = iframes[i].parentNode;
      var p = parent;
      
      if (parent.nodeName == 'P') {
         p.parentNode.insertBefore(iframes[i], p);
         parent = p.parentNode;
         p.remove();
      }
      
      var wrap = document.createElement('div');
      wrap.className = 'wrap_iframe';
      parent.insertBefore(wrap, iframes[i]);
      
      var container = document.createElement('div');
      container.className = 'iframe_container';
      wrap.appendChild(container);
      
      container.appendChild(iframes[i]);
   }      
</script>