Generate TreeView (Structure) from XML using jQuery

Code:

                                        <script type="text/javascript" src="http://code.jquery.com/jquery-1.7.2.js"></script>
                                        <script type="text/javascript">
                                        $(document).ready(function () {
                                        $('button.btn-primary').click(function(){
                                        $('#formView').hide();
                                        $('#treeView').show();
                                        var tree = $.parseXML($('textarea').val());
                                        traverse($('#treeView li'),tree.firstChild)
                                        // this – is an —
                                        $('<b>–<\/b>').prependTo('#treeView li:has(li)').click(function(){
                                        var sign=$(this).text()
                                        if (sign=="–")
                                        $(this).text('+').next().children().hide()
                                        else
                                        $(this).text('–').next().children().show()
                                        });
                                        });

                                        function traverse(node,tree) {
                                        var children=$(tree).children()
                                        node.append(tree.nodeName)
                                        if (children.length){
                                        var ul=$("<ul>").appendTo(node)
                                        children.each(function(){
                                        var li=$('<li>').appendTo(ul)
                                        traverse(li,this)
                                        })
                                        }else{
                                        $('<ul><li>'+ $(tree).text()+'<\/li><\/ul>').appendTo(node)
                                        }
                                        }
                                        });
                                        </script>