How to submit an form after an time interval?

<?php
include("config.php");
$sql=mysql_query("select * from timer");
$row_2=mysql_fetch_array($sql);
$row_2['num_timer'];
?>

 <div style="font-weight: bold" id="quiz-time-left"></div>

<script type="text/javascript">
var max_time = <?php echo $row_2['num_timer'] ?>;
var c_seconds  = 0;
var total_seconds =60*max_time;
max_time = parseInt(total_seconds/60);
c_seconds = parseInt(total_seconds%60);
document.getElementById("quiz-time-left").innerHTML='Time Left: ' + max_time + ' minutes ' + c_seconds + ' seconds';
function init(){
document.getElementById("quiz-time-left").innerHTML='Time Left: ' + max_time + ' minutes ' + c_seconds + ' seconds';
setTimeout("CheckTime()",999);
}
function CheckTime(){
document.getElementById("quiz-time-left").innerHTML='Time Left: ' + max_time + ' minutes ' + c_seconds + ' seconds' ;
if(total_seconds <=0){
setTimeout('document.quiz.submit()',1);
  
    } else
    {
total_seconds = total_seconds -1;
max_time = parseInt(total_seconds/60);
c_seconds = parseInt(total_seconds%60);
setTimeout("CheckTime()",999);
}

}
init();
</script>

<form method="post" name="quiz" id="quiz_form" action="query.php" >
</form>