asp.net jquery 三级联动

 var j = jQuery.noConflict();
var prov="";
var city="";
var area="";
j(function(){
    j.get("/Js/Message/address.xml",function(xml){
            j("body").data("xml",xml);
            j("#province_city_area").append("<select id='_province'></select>&nbsp;<select id='_city'></select><select id='_area'></select>");
            j("province",xml).each(function(){
                if(j(this).attr("province")==prov)
                    j("#_province").append("<option value="+j(this).attr("provinceID")+" selected>"+j(this).attr("province")+"</option>");
                else
                j("#_province").append("<option value="+j(this).attr("provinceID")+">"+j(this).attr("province")+"</option>");
            });//初始省
            LoadCity(j("#_province").val().substr(0,3),xml); //初始市 
            LoadArea(j("#_city").val().substr(0,4),xml); //初始区
            
            j("#_province").change(function(){