Jquery responsive iframe

(function(){
    // Find all YouTube videos
    var $allVideos = $(".video_responsive"),

    // The element that is fluid width
    $fluidEl = $("body");

    // Figure out and save aspect ratio for each video
    $allVideos.each(function() {
      $(this)
        .data('aspectRatio', this.height / this.width)
        // and remove the hard coded width/height
        .removeAttr('height')
        .removeAttr('width');
    });

    // When the window is resized
    $(window).resize(function() {
      // Resize all videos according to their own aspect ratio
      $allVideos.each(function() {        
        var $el = $(this);
        var $parW = $(this).parent().width();
        $el
          .width($parW)
          .height($parW * $el.data('aspectRatio'));
      });

    // Kick off one resize to fix all videos on page load
    }).resize();
})();