function getArea(obj,purpose){
//	$('#'+purpose).load('/getArea.ashx?city='+$(obj).val());
    
    var s = document.getElementById(purpose); 

    s.options.length=0;
    var city=$(obj).val();
        $.getJSON('/getArea.ashx?city='+escape(city),
            function(data){
                $('#areacode').val('');
                for (var i=0;i<data.city.length;i++){
                    var new_option = new Option(data.city[i].area,data.city[i].areacode);
                    s.options.add(new_option);
                    if (i==0){$('#areacode').val(data.city[i].areacode);}
                }

            });
    
}