title: JQuery sortable lists and fixed/locked items
body: <p>Is it possible to lock list items in JQuery sortable list in a way that those items will stay in that particular place in the list.</p>
  
  <p>For example, </p>
  
  <p>consider this pseudo list with locked items...</p>
  
  <pre><code>item A
  item B(locked)
  item C(locked)
  item D
  item E
  item F
  item G(locked)
  </code></pre>
  
  <p>So, I'd like to have the items B,C and G to be fixed in a way that if user drag and drop item D at the start of the list, the item A "jumps" over fixed/locked items  B and C with following results...</p>
  
  <pre><code>item D
  item B(locked)
  item C(locked)
  item A
  item E
  item F
  item G(locked)
  </code></pre>
  
  <p>I've been searching for something like this without luck. Is it possible..?</p>