.tree{margin:0px;padding:0px;}
.tree ul{padding-left:5px;margin-left:5px;border-left:1px dashed #ccc;}
.tree li{list-style:none;clear:both;margin:2px;}
.tree li.treeopen ul{display:block;}
.tree li.treeclose ul{display:none;}

span.node{display:block;float:left;width:10px;height:16px;background:url(/img/bullet.gif) no-repeat center left;}
span.nodeopen{display:block;float:left;width:30px;height:16px;background:url(/img/minus.gif) no-repeat center left;cursor:pointer;}
span.nodeclose{display:block;float:left;width:30px;height:16px;background:url(/img/plus.gif) no-repeat center left;cursor:pointer;}