function showSubmit(){
  if(formCheck()){
    var str= '';
    str= '../feedback/guestok.asp?' +'message='+document.adv.content.value+'&sender_email='+document.adv.sender_email.value+'&verifycode='+document.adv.verifycode.value;              
    document.adv.content.value = "";
    document.adv.sender_email.value = "請輸入您的電子郵箱";
    document.adv.verifycode.value = "";
    win=window.open(str,'contact','width=550,height=330,scroll bars=no,status=no,toolbar=no,menubar=no,location=no');win.focus();
  }
}

function formCheck(){
  var msg = "";

  if (document.adv.content.value == ""){
    msg = "請填上您的建議！\n";
  }

  if(document.adv.content.value.length>200){
    msg = "您輸入的內容太長！請控制在200字以內！\n";
  }

  var str1 = document.adv.sender_email.value;
  if(str1.indexOf("@") == -1 || str1.indexOf(".") == -1){
    msg += "您填的信箱格式不正確！\n"
  }

  var str2 = document.adv.verifycode.value;
  var rx = /^\d{4}$/;
  if(!rx.test(str2)){
    msg += "您沒有填寫驗證碼，請填寫驗證碼！\n"
  }

  if( msg != "" ) {
    str1 = "對不起，由於您的信息不全，\n";
    str1 += "所以沒有遞交成功！\n\n";
    msg = str1 + msg;
    msg +=  "\n請在填全信息後再遞交一次。謝謝！"
    alert(msg);
    return false;
  }else{
    var str1 = document.adv.sender_email.value
    if(str1 == ""){
      document.adv.sender_email.value="username@domain.com"
    }
  }

  var s = "\n=============\n";
  s += "\n建議:";
  s += document.adv.content.value;
  document.adv.message.value = s;
  return true;
}