$(function() {
        $("#filemanager").selectable({
            filter: 'tr',
            start: function() {
                $("tr.ui-selected").each(function() {
                    $(this).draggable('destroy');
                });
            },
            stop: function() {
                $("tr.ui-selected").draggable({
                    helper: function() {
                        var dom = [];

                        dom.push("<div style=\"border:5px solid black;width:753px;height:30px;line-height:25px;\">",
                            "<center>Files Selected: 1</center></div>");

                        return $(dom.join(''));
                    },

                    revert: 'invalid',
                    appendTo: 'parent',
                    containment: '#filemanager',
                    axis: 'y',
                    cursor: '-moz-grabbing'
                });
            }
        });
    });