rem: return Sortable._tree (element, options, root); 
add: return Sortable._tree(element, options, root); 
context:   tree: function(element) {    element = $(element);    var sortableOptions = this.options(element);    var options = Object.extend({      tag: sortableOptions.tag,      treeTag: sortableOptions.treeTag,      only: sortableOptions.only,      name: element.id,      format: sortableOptions.format    }, arguments[1] || {});        var root = {      id: null,      parent: null,      children: new Array,      container: element,      position: 0    }        return Sortable._tree (element, options, root);  },
meta: 4707	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4707/50c3492c4c3c825dbd3401e134a19ed46799c456/dragdrop.js/clean/www/resources/scriptaculous/dragdrop.js