jQuery sortable - PHP

I am using the jQuery sortable() to order images in a DB. The HTML is as follows.

<h2>Revision 1</h2>

<ul class='sortable'>
<li class='sortPhotos' id='item_249745' >
     <img src="../data/gallery/13387/images/album/1650519801.jpg"/>
     <p>1650519801.jpg</p>
</li>
<li class='sortPhotos' id='item_249744' >
     <img src="../data/gallery/13387/images/album/704633205.jpg"/>
     <p>704633205.jpg</p>
</li>
</ul>

<h3>Revision 2</h3>

<ul class='sortable'>
<li class='sortPhotos' id='item_518811' >
     <img src="../data/gallery/13387/images/album/001.jpg"/>
     <p>001.jpg</p>
</li>
<li class='sortPhotos' id='item_518812' >
     <img src="../data/gallery/13387/images/album/003.jpg"/>
     <p>003.jpg</p>
</li
</ul>

The JS

<script>

    $(".sortable").sortable({stop:function(i) {
            $.ajax({
                type: "GET",
                url: "../albumUploader/queries/sort.php",
                data: $(".sortable").sortable("serialize")
            });
        },
        opacity:1.0
    });    
</script> 

And finally the SQL

foreach($_GET['item'] as $key=>$value) {

    mysql_query("   UPDATE galleryimage
                    SET sort = '{$key}'
                    WHERE id = '{$value}'  
                   ");
}

The issue with the above example -- the first revision is the only revision that is actually sorting in the DB. The other revision(s) are not. It does appear from monitoring the network in Chrome web developer extension that both lists are sending to the DB, but the second is not writing. Any ideas on this one?

Each sortable needs to have it's own unique id. I resolved it with:

ul id='sortable_" . $count ."'
$count++;

$(".revisionNum").each(
        function(e) {
        num = e + 1;
        $("#sortable_" + num).sortable(
            {stop:function(i) {
                serial = $("#sortable_"  + num).sortable("serialize");
                $.ajax({
                    type: "GET",
                    url: "../albumUploader/queries/sort.php",
                    data: serial
                });
            },
            opacity:1.0
        });    
    });

One solution would be to only send one list to the server at a time. This could be done by sending the data from $(this) instead of from $(".sortable"):

$(".sortable").sortable({stop:function(i) {
        $.ajax({
            type: "GET",
            url: "../albumUploader/queries/sort.php",
            data: $(this).sortable("serialize")
        });
    },
    opacity:1.0
});