function Querystring(qs){this.params=new Object();this.get=Querystring_get;if(qs==null)qs=location.search.substring(1,location.search.length);if(qs.length==0)return qs=qs.replace(/\+/g,' ');var args=qs.split('&');for(var i=0;i<args.length;i++){var value;var pair=args[i].split('=');var name=unescape(pair[0]);if(pair.length==2)value=unescape(pair[1]);else value=name;this.params[name]=value}};function Querystring_get(key,default_){if(default_==null)default_=null;var value=this.params[key];if(value==null)value=default_;return value}