function process_data(form) {
    var str = form.message.value;
    var SPECIAL_STR = "~`%&*;\><[]{}\\|/—";

    if (form.message.value=="") {
        alert("请填写内容!");
        form.message.focus();
        return false;
    }
                
    for (i=0;i<str.length;i++)
    if (SPECIAL_STR.indexOf(str.charAt(i)) !=-1){
       alert("留言中不能含有非法字符("+str.charAt(i)+")!");
       form.message.focus();
       return false;
    }

    if (form.verifynum.value==""){
       alert("请输入验证码!");
       form.verifynum.focus();
       return false;
    }
    if (form.verifynum.value == "" || form.verifynum.value.length != 4) {
       alert("请输入正确的验证码!");
       form.verifynum.focus();
       return false;
    }
    if (form.verifynum.value!="8025"){
       alert("验证码出错!");
       form.verifynum.value="";
       form.verifynum.focus();
       return false;
    }
    alert("感谢您对本文的关注，您的评论将在审核后发布！");
    return true;
}