[jQuery] sortable: drag list items by custom handle

[jQuery] sortable: drag list items by custom handle

Hi there,
I am using $("#myList").sortable({}); to "sortable-ize" a ul list. All works fine, however the entire "li" element responds to dragging and I want the "li" elements to be draggable only by using a custom handle like this:
<li id="list_1">
    some content here
    <div class="custom_handle">MY HANDLE</div>
</li>
Any ideas? Thank you!
emi