各位帮个忙，子窗口打开了，按键不响应servlet，是参数没传进去？

Question

ConsultationServlet：

public void buy(HttpServletRequest request,
HttpServletResponse response) throws IOException {

int rem_id = Integer.parseInt(request.getParameter("hi"));
ConsultationService cs = new ConsultationService();
...
if (rtn.equals("1")) {
response.setContentType("text/html;charset=GBK");

        PrintWriter out = response.getWriter();
        out.write("<script  type=\"text/javascript\">");
        out.print("alert('购买成功！待会诊');");
        // //子窗口刷新父窗口
        out.write("self.opener.location.reload();");
        // 关闭窗口
        out.write("window.opener=null;");
        out.write("window.close();");
        out.write("</script>");
        out.close();

}
这是子窗口jsp代码
function fn(){
var id1 = window.dialogArguments;
document.getElementById("hi").value = id1;
var str="ConsultationServlet?flag=buy&rem_id="+ id1;
alert("您传递的参数为：" + str);

var form = document.getElementById("news");
form.action="ConsultationServlet?flag=buy";
form.submit(); ;

body id="bo" 
form id="news" method="post"
haha
input type="hidden" name="hi" id="hi"
input type="button" value="申请授权" onclick="fn()"