.nav-group.tree .navigation-item{
      position:relative;
    }
    .nav-group.tree span.handler{
      width:16px;
      height:16px;
      background:url('images/close.gif') 50% 50% no-repeat;
      position:absolute;
      left:-15px;
      top:6px;
      cursor:pointer;
      z-index:80;
    }
    .nav-group.tree .sub-navigation-group.close,
    .nav-group.dropdown .sub-navigation-group.close{
      display:none;
    }
    .nav-group.tree .sub-navigation-group.open,
    .nav-group.dropdown .sub-navigation-group.open{
      display:block;
    }