title: Toggle select options w/jQuery
body: <p>I have selector with multiple option grouped into option groups. I am trying to toggle select/deselect of all options when an optgroup label is clicked.</p>
  
  <p>It works fine on initial load, but I also have a functionality that allows me to copy options from one selector to another and back. Once options are copied my toggle stops working.</p>
  
  <pre><code>$("optgroup").toggle(function(){
      $(this).children().attr("selected", "selected");
  }, function() {
      $(this).children().attr("selected", false);
  });
  </code></pre>
  
  <p>Here's the <a href="http://jsfiddle.net/SwrVK/6/" rel="nofollow">copy/remove script</a>.</p>