function initProvice(province,city,town){
				var province = $(province);
				var city     = $(city);
				var town     = $(town);
				var data     = obj.data;
				var _options = new Option('不限',0);
				province.options.length = 0;
				city.options.length = 0;
				town.options.length = 0;
				
				province.options.add(new Option('不限',0));
				city.options.add(new Option('不限',0));
				town.options.add(new Option('不限',0));
				
				var _proVal  = province.getAttribute('myvalue');
				var _cityVal = city.getAttribute('myvalue');
				var _townVal = town.getAttribute('myvalue');
				
				for(var i in data){
					var option = new Option(data[i].name,i);
					province.options.add(option);
				}
				province.value  = _proVal;
				
				var _initCity = function(){
					var value = province.value;
					var citys = data[value].citys;
					city.options.length  = 1;
					town.options.length  = 1;
					for(var i in citys){
						city.options.add(new Option(citys[i].name,i));
					}
				};
				
				var _initTown = function(){
					var citys = data[province.value]['citys'][city.value];
					town.options.length  = 1;	
					if(citys && citys.towns){
						var towns = citys.towns;
						town.options.length  = 1;
						for(var i in towns){
							town.options.add(new Option(towns[i].name,i));
						}
					}
				};
				
				if(_cityVal && _cityVal!= '0'){
					_initCity();
					city.value = _cityVal;
				}
				
				if(_townVal && _townVal!='0'){
					_initTown();
					town.value = _townVal;
				}
				//不限
				province.addEvent('change',function(){
					var value = province.value;
					if(data[value] && data[value].citys){
						_initCity();	
					}else{
						city.options.length  = 1;
						town.options.length  = 1;
					}
				});	
				
				city.addEvent('change',function(){
					if(data[province.value] && data[province.value]['citys'] && data[province.value]['citys'][city.value]){
						_initTown();
					}else{
											
						town.options.length  = 1;
					}
				});			
			}