text: 
  // treeTweak.js
  // jt6 20070115 WTSI.
  //
  // augment the base TextNode from Yahoo with functions to walk down
  // the tree. These methods are here to allow cascades to work for
  // TextNodes, although we're primarily interested in the TaskNodes,
  // which have a check method from the outset
  //
  // $Id: treeTweak.js,v 1.2 2008-05-16 14:58:22 jt6 Exp $
  
  // Copyright (c) 2007: Genome Research Ltd.
  // 
  // Authors: Rob Finn (rdf@sanger.ac.uk), John Tate (jt6@sanger.ac.uk)
  // 
  // This is free software; you can redistribute it and/or modify it under
  // the terms of the GNU General Public License as published by the Free Software
  // Foundation; either version 2 of the License, or (at your option) any later
  // version.
  // 
  // This program is distributed in the hope that it will be useful, but WITHOUT
  // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  // FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
  // details.
  // 
  // You should have received a copy of the GNU General Public License along with
  // this program. If not, see <http://www.gnu.org/licenses/>.
  
  YAHOO.widget.TextNode.prototype.check = function( state ) { 
    for( var i = 0; i < this.children.length; i++ ) {
  	this.children[i].check( state );
    }
  };
  
  YAHOO.widget.TextNode.prototype.uncheck = function( state ) { 
    this.check( 0 );
  };
  