YouTube iframe Embed and Resize to Content

page.html

<script src="page.js"></script>
...
<!-- You can set the initial size to something sensible, but it will get resized on loading -->
<iframe src="http://www.youtube.com/embed/VIDEO_ID" width="560" height="315"></iframe>
...

page.js

(function($,sr){
 
  // debouncing function from John Hann
  // http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
  var debounce = function (func, threshold, execAsap) {
      var timeout;
 
      return function debounced () {
          var obj = this, args = arguments;
          function delayed () {
              if (!execAsap)
                  func.apply(obj, args);
              timeout = null; 
          };
 
          if (timeout)
              clearTimeout(timeout);
          else if (execAsap)
              func.apply(obj, args);
 
          timeout = setTimeout(delayed, threshold || 100); 
      };
  }
	// smartresize 
	jQuery.fn[sr] = function(fn){  return fn ? this.bind('resize', debounce(fn)) : this.trigger(sr); };
 
})(jQuery,'smartresize');
 
 
// usage:
//$(window).smartresize(function(){  
//  // code that takes it easy...
//});

$(function() {

	// Find all YouTube videos
	var $allVideos = $("iframe[src^='http://www.youtube.com']"),

	    // The element that is fluid width <-- This needs to be changed!
	    $fluidEl = $("article");

	// 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
	// (You'll probably want to debounce this)
	$(window).smartresize(function() {

		var newWidth = $fluidEl.width();
		
		// Resize all videos according to their own aspect ratio
		$allVideos.each(function() {

			var $el = $(this);
			$el
				.width(newWidth)
				.height(newWidth * $el.data('aspectRatio'));

		});

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

});