function mthArea(areaId, areaName, subAreaList) { 
this.areaId = areaId; 
this.areaName = areaName; 
this.subArea = subAreaList; 
this.getAreaId = function() { 
return this.areaId; 
} 
this.getAreaName = function() { 
return this.areaName; 
} 
} 
function areaList() { 
this.list = new Array(); 
this.areaId = new Array( 
4500001, 
4500002, 
4500003, 
4500004, 
4500005, 
4500006, 
4500007 
); 
this.areaName = new Array( 
'东城区', 
'南城区', 
'莞城区', 
'万江区', 
'虎门镇', 
'长安镇', 
'其他' 
); 
for (var i = 0; i < this.areaName.length; i++) { 
this.list[i] = new mthArea(this.areaId[i], this.areaName[i], ''); 
} 
} 
var area_list = new areaList(); 
area_list.get = function (i) { 
return area_list.list[i]; 
} 
area_list.size = function () { 
return area_list.list.length; 
} 
area_list.getAreaById = function(id) { 
for (var i = 0; i < area_list.size(); i++) { 
if (area_list.list[i].getAreaId() == id) { 
return area_list.list[i]; 
} 
} 
} 
function loadArea(obj) { 
obj.options.length = 1; 
for (var i = 0; i < area_list.size(); i++) { 
obj.add(document.createElement(OPTION)); 
obj.options[i + 1].text = area_list.get(i).getAreaName(); 
obj.options[i + 1].value = area_list.get(i).getAreaId(); 
} 
} 
function selectArea(id, obj) { 
for (var i = 0; i < obj.length; i++) { 
if (obj.options[i].value == id) { 
obj.options[i].selected = true; 
break; 
} 
} 
}