jquery sortable alert this list id

Really need help

i am using jquery sortable.

And i am looking to grab just the id from the list element that 开发者_如何学Cis being dragged.

"Not all off them"

Here is an example http://jsfiddle.net/isimpledesign/85LdV/1/

this alerts back an array but i need it to give me back just the id of the element that is being dragged so i can pass it to a php file.

Can someone please help me with this????

---

Just to clarify Chad's answer a bit -

$(function() {
    $("#sortable").sortable({
        update: function(event, ui) {
            // i need to get the class text that is being dragged i.e
            var order = $(this).sortable("serialize");
            alert(order); 
            /*
             No need to bind any other events, ui.item is the dragged
             item in 'update' too and we only want to capture the id when the sort
             has changed presumably
            */
            alert(ui.item.attr('id'));
            /*
             No need for subscripting, ui.item is a jquery object so 
             we can just call attr() on it to get the ID
            */
        }
    });
});

---

Use the start event:

$(function() {
   $("#sortable").sortable({
      update: function(event, ui) {
         // i need to get the class text that is being dragged i.e
        var order = $(this).sortable("serialize");
        alert(order);   
      },
      //Start event fires on the start of a sort
      //you can store the id from in here
      start: function(event, ui) {
         //here ui.item contains a jquery object that is the item being dragged
         alert(ui.item[0].id);
      }
   });
});

---

Use this:

$(function() {
    var lastMoved = null;
    $("#sortable li").mousedown(function(){
        lastMoved = this;
    });
    $("#sortable").sortable({
      update: function(event, ui) {
        alert($(lastMoved).attr("id"));
      }
    });
});

It's tested and working. Hope this helps. Cheers.