Make save and exit button javascript

JavaScript
5

can you help me with the script please? i dont know where to put the code on my script

this is my test.php

<?php
session_start();
require_once("connection.php");
if ($_SESSION['email']=='') {
    header("location: index.php");
  }else{
    mysql_error();
  }

  include("lib_function.php");
?>

<!DOCTYPE html>
<html lang="en">
<head>
<title>TOEFL Online</title>
<meta charset="utf-8">
<link rel="icon" href="">
<link rel="stylesheet" href="css/style.css">
<script language="JavaScript" src="js/button.js"></script>
<script type='text/javascript' src='http://code.jquery.com/jquery-1.10.2.min.js'></script>

<script>
  var times = 150;
  var time;
  var go = 0;
  var end = 0;
  
  function init(){
checkCookie()
start();
  }

  function keluar(){
if(end==0){
  setCookie('waktux',time,1);
}else{
  setCookie('waktux',0,-1);
}
  }
  
  function start(){
hour = Math.floor(time/3600);
sisa = time%3600;
minute = Math.floor(sisa/60);
sisa2 = sisa%60
second = sisa2%60;

if(minute < 1 && hour == 0){
  var peringatan = 'style="color:red"';
}

if(second<10){
  detikx = "0"+second;
}else{
  detikx = second;
}

if(minute<10){
  menitx = "0"+minute;
}else{
  menitx = minute;
}

if(hour<10){
  jamx = "0"+hour;
}else{
  jamx = hour;
}

  document.getElementById("divwaktu").innerHTML = '<h4 align="right"'+peringatan+' style="color:#991111;" >time: &nbsp;&nbsp;&nbsp;'+ menitx + ' : ' + detikx + '</h4>'
time --;
if(time>0){
  t = setTimeout("start()",1000);
  go = 1;
}else{
  if(go==1){
    clearTimeout(t);
  }
  end = 1;
  document.getElementById("formulir").submit();
  }
}

  function selesai(){
document.getElementById("formulir").submit();
  }

  function getCookie(c_name){
if (document.cookie.length>0){
  c_start=document.cookie.indexOf(c_name + "=");
    if (c_start!=-1){
      c_start=c_start + c_name.length+1;
      c_end=document.cookie.indexOf(";",c_start);
      if (c_end==-1) c_end=document.cookie.length;
        return unescape(document.cookie.substring(c_start,c_end));
    }
}
return "";
  }

  function setCookie(c_name,value,expiredays){
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
  }

  function checkCookie(){
waktuy=getCookie('waktux');
if (waktuy!=null && waktuy!=""){
  time = waktuy;
}else{
  time = times;
  setCookie('waktux',times,7);
}
  }
</script>
</head>
<body onload="init()" onunload="keluar()">

<!--Start Header-->
<header class="page1">
  <div class="container_12">
    <div class="grid_12">
      <h1><a href="#" onClick="goToByScroll('page1'); return false;"><img height="30px" width="1300px" src="images/logo2.png" alt=""></a></h1>
        <div class="menu_block">
        <nav class="">
          <ul class="sf-menu">
            <li class="timer"><div id="divwaktu"></div></li>
            <li class="men1"><a href="index.php">Home</a><strong class="hover"></strong></li>
            <li class="men1"><a href="#">Save and Exit</a><strong class="hover"></strong></li>
            <li class="men1"><a href="index.php">End</a><strong class="hover"></strong></li>
            <?php 
            $cek = cek_login();
            
            if ($cek == 0){
              echo "<li class=\"men4\"><a href=\"index.php\">Login</a> <strong class=\"hover\"></strong></li>";
            }else{
              echo "<li class=\"men4\"><a href=\"proseslogout.php\">Logout</a> <strong class=\"hover\"></strong></li>";
            }
          ?>
        </ul>
        </nav>
      </div>
    </div>
  </div>
</header>
<!--End Header-->

<div id="page2" class="content">
<div class="container_12">
  <div class="grid_14">
    <div class="box">
    <div style="color:#666666; font-size:30px; padding-bottom:20px; ">Structure and Written Expression
      </div>

          <div class="box3"> <br>
          <form action="hasil_structure.php" method="POST" id="formulir">
            <?php
              include "connection.php";
              $soal = mysql_query("SELECT * FROM structure order by rand() limit 40");
              $no = 1;
              while($s = mysql_fetch_array($soal)){
              echo "$no. <b>".$s['pertanyaan']."</b><br>\n";
              echo "<input type=radio name=soal[".$s['no']."] value='a'>A. ".$s['a']."<br>\n";
              echo "<input type=radio name=soal[".$s['no']."] value='b'>B. ".$s['b']."<br>\n";
              echo "<input type=radio name=soal[".$s['no']."] value='c'>C. ".$s['c']."<br>\n";
              echo "<input type=radio name=soal[".$s['no']."] value='d'>D. ".$s['d']."<br><br><br>\n";
              $no++;
              }
              $jumlahsoal = $no - 1;
              echo "<input type='hidden' name='jumlahsoal' value= $jumlahsoal>";
            ?>
            <input style="width:200px; margin-left:180px; height:30px; border:1px; font-family:'Trebuchet MS'; font-size:15px;" type="submit" value="DONE"/><br><br>
        
          </form>
          
        </div>
    </div>
  </div>    
</div>
</div>
</body>
</html>