if(this.data.themes) { 
                    if(m) { m.attr("class", "jstree-" + this.data.themes.theme); }
                    if(ml) { ml.attr("class", "jstree-" + this.data.themes.theme); }
                    $.vakata.dnd.helper.attr("class", "jstree-dnd-helper jstree-" + this.data.themes.theme); 
                }