163k地方门户网站系统后台在Firefox下无法通过选择区域来获取相对应的地段，IE浏览器下无些问题．
Firebug提示错误为：
ReferenceError: requestdataquyu is not defined
xmlhttp.onreadystatechange=requestdataquyu;
Chrome javascript控制台错误：
Uncaught TypeError: Cannot read property 'options' of null
xmlhttp.onreadystatechange
修改方法为：将xmlhttp.onreadystatechange=requestdataquyu;
改为xmlhttp.onreadystatechange=function(){
//requestdataquyu code is here.
}