Sortable (JQUI): Don't allow items to be dragged above non sortable items.

Ok before I write a bunch of code to catch and loop.  Any ideas on how to do this.

I have a UL that returns items.  They will always come back with "standard" items first then custom.

I have locked the standard ones down so they can't be moved/sorted in the list.  

The issue is:  I don't want any custom ones to be able to be dragged above the standard ones.  

Looks like this:

<ul id="jqWidSelected" class="jqSortableDash ui-sortable">
<li class="dBBBorBottom fixed dBBAlt" data-id="AE10BCF3-B2C0-474C-BA27-750426330529" style="height:70px;">
<li class="dBBBorBottom fixed" data-id="C30D2FAC-AE62-43D0-A833-73B5A67F2494" style="height:70px;">
<li class="dBBBorBottom dBBAlt" data-id="E0FE32F2-795E-4435-A117-EAFD28718FFD" style="height:70px;">
<li class="dBBBorBottom " data-id="8392F1B2-7115-4575-A230-611D55AC0140" style="height:70px;">
<li class="dBBBorBottom dBBAlt" data-id="066E3E2D-1182-4E39-B6BD-4BBE7659A2C3" style="height:70px;">
<li class="dBBBorBottom " data-id="2C0F5B37-824B-4D08-BFA0-1D2C0940F91F" style="height:70px;">
</ul>


NOTE:  fixed on LI determines locked or disabled

Select allOpen in new window

currently I sort with this:

    //  handle drag sort for dash order SORT
    $('.jqSortableDash').sortable({
        cancel: ".fixed",
        delay: 100,
        //connectWith: ".handleDrag",
        stop: function (event, ui) {
            p.HandleSortDash(ui, ui.item)
        },
        start: function (event, ui) { }
    }).disableSelection();

which calls this...basically just handles the order to the DB


//-------------------------    HANDLE SORT DASH   ------------------------------------------------------------ //
//
IPpage.prototype.HandleSortDash = function (ui, e) {
    var orderBy = '';

    $('#jqWidSelected li').each(function (i) {
        var n = $(this);
        n.find('.jqNum').html((i + 1));
        orderBy += '|' + n.attr('data-id');
    });
    //  update db
    this.HandleDBPreferenceCRUD(orderBy, 50);
    return;
}v

Select allOpen in new window

thanks in advance