Sortable Placeholder

Dear Group,
I used the JQuery sortable function for this webpage:
http://variouselmts.com/development/projektil/
Here is the code I used:
        $(document).ready(function() {
            $(".navigation a").click(function() {
                var link = $(this);
                var lang = link.attr("lang");
                var href = "content/" + lang + "/" + link.attr("href");
                $.ajax({url: href, cache: false, success: function(content) {
                    $(".content[lang=" + lang + "]").prepend("<li>" + content + "</
li>");
                    link.parent().css("display", "none");
                    var h1 = $(".content[lang=" + lang + "] h1");
                    h1.hover(function() {
                        h1.css("cursor", "move");
                        }, function() {
                        h1.css("cursor", "default");
                        });
                    var getid = link.text();
                    $(".content[lang=" + lang + "]").sortable({
                        placeholder: "placeholder",
                        handle: $("h1"),
                        out: function(e, ui) {
                            if(ui.absolutePosition.left > 200 || ui.absolutePosition.left <
0) {
                                var getid = ui.item.find("div").attr("id");
                                var geta = $(".navigation a:contains('" + getid + "')");
                                geta.parent().css("display", "inline");
                                ui.item.remove();
                                }
                            }
                        });
                    }});
                return false;
                });
            });
It works pretty fine, but sometimes the code produces multiple
placeholders or other weird things,
can you try it and tell me if there is anything I can do about that?
Many Thanks