jquery ajax ie 和firefox问题

[size=14px]下面的jquery代码在ie中正常运行,在firefox中无法运行
firefox返回的好像是xmlobject对象,不知道如何处理,达人赐教![/size]
Js代码
function ajaxCheckName(){
var name = $("input[name=uname]").val();

$.post('AjaxCheckName', {'uname':name}, function(data){
$("#ajaxCheckName").html(data);

});
$("input[name=uname]").toggleClass("fontcolor");
//$("#ajaxCheckName").html("检测用户名状态").toggle();
}

function ajaxCheckName2(){
var name = $("input[name=uname]").val();
$.ajax({
type: "POST",
url: "AjaxCheckName",
data: "uname=" + name,
success: function(msg){
$("#ajaxCheckName").html(msg);
}
});
}
Servlet代码:
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String name = request.getParameter("uname");
System.out.println(name);
PrintWriter out = response.getWriter();
if(biz.hasName(name)){
out.println("<font color='red'>用户名不存在,你可以使用该用户名注册:-D</font>");
}else{
out.println("<font color='red'>用户名已存在,你不能使用该用户名注册'%'>_<'%'</font>");
}
out.flush();
}

用alert()检测一下吧！！！