//*** This code is copyright 2002-2003 by Gavin Kistner and Refinery; www.refinery.com
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt
function addClass(obj,cName){removeClass(obj,cName); return obj && (obj.className+=(obj.className.length>0?' ':'')+cName); }
function removeClass(obj,cName){ return obj && (obj.className=obj.className.replace(new RegExp("^"+cName+"\\b\\s*|\\s*\\b"+cName+"\\b",'g'),'')); }
function hasClass(obj,cName){ return (!obj || !obj.className)?false:(new RegExp("\\b"+cName+"\\b")).test(obj.className) }