考试系统的计时问题

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<?phprequire_once '../module/prepend.inc';
//require_once '../module/functions.inc';
require_once '../module/DataObject.inc';
require_once '../module/PhpTemplate.php';
require_once '../module/t_questions.inc';
require_once '../module/com_test.inc';
//require_once '../module/page_class.inc';
@session_start();
//echo $_SESSION['time_in'];
$com_test=new com_test();
$t_questions = new t_questions();
if($_SESSION['type']==1){//全科医生
$sql="SELECT * FROM `t_questions` where `type`=5 or `type`=4 or type=6  ORDER BY rand( ) LIMIT 20";
$answerList=$t_questions->_execute($sql);
}
if($_SESSION['type']==2){//护士
$sql="SELECT * FROM `t_questions` where `type`=2 or `type`=4 or type=6  ORDER BY rand( ) LIMIT 20";
$answerList=$t_questions->_execute($sql);
}
if($_SESSION['type']==3){//防保人员
$sql="SELECT * FROM `t_questions` where `type`=7 or `type`=4 or type=6  ORDER BY rand( ) LIMIT 20";
$answerList=$t_questions->_execute($sql);
}
if($_SESSION['type']==4){//中医
$sql="SELECT * FROM `t_questions` where `type`=8 or `type`=1 or type=6  ORDER BY rand( ) LIMIT 20";
$answerList=$t_questions->_execute($sql);
}
if($_SESSION['type']==5){//医技人员
$sql="SELECT * FROM `t_questions` where `type`=3 or `type`=6 ORDER BY rand( ) LIMIT 20";
$answerList=$t_questions->_execute($sql);
}
if($_SESSION['type']==6){//口腔
$sql="SELECT * FROM `t_questions` where `type`=3 or `type`=6  ORDER BY rand( ) LIMIT 20";
$answerList=$t_questions->_execute($sql);
}

$_SESSION['answer']=0;//答题对的道数?>
这是PHP语句
时间到了用document.all.form1.submit会把用户答案提交的。下面的js代码，用了服务器时间判定用户考试时间的。
function GetRTime(){
var nMS = <?=$data['lefttime']?>-runtimes;
var nM=Math.floor(nMS/(60)) % 60;
if(nM>0){
document.getElementById("remaintime").innerHTML=nM+'分钟';
}else{
var nS=nMS % 60;
document.getElementById("remaintime").innerHTML=nS+'秒';
}

if(nMS<0)
{
document.all.form1.submit();
}
runtimes++;
setTimeout("GetRTime()",1000);
}
我用document.all.form1.submit判断时间到提交
但是不执行if($_POST["submit1"]=="提交"){
$_SESSION['answer']=0;
if($_POST['1']==$_SESSION[1])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['2']==$_SESSION[2])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['3']==$_SESSION[3])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['4']==$_SESSION[4])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['5']==$_SESSION[5])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['6']==$_SESSION[6])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['7']==$_SESSION[7])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['8']==$_SESSION[8])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['9']==$_SESSION[9])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['10']==$_SESSION[10])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['11']==$_SESSION[11])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['12']==$_SESSION[12])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['13']==$_SESSION[13])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['14']==$_SESSION[14])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['15']==$_SESSION[15])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['16']==$_SESSION[16])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['17']==$_SESSION[17])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['18']==$_SESSION[18])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['19']==$_SESSION[19])$_SESSION['answer']=$_SESSION['answer']+1;
if($_POST['20']==$_SESSION[20])$_SESSION['answer']=$_SESSION['answer']+1;

$time=date("Y-m-d H:i:s",time());
$com_test->reset();
$kaoshifen=$_SESSION['answer']*5;
$sql="INSERT INTO `text_hossystem`.`com_test` (
`id` ,
usename,
`name` ,
`lianxifen` ,
`kaoshifen` ,
`time`
)
VALUES (
NULL , '".$_SESSION['name']."','".$_SESSION['s_name']."', '', '".$kaoshifen."', '".$time."'
)
";
$insert = $com_test->_execute($sql);
AlertMsg("提交答案!");
GotoWeb("./questions_answer.php");
//die();
}
这段代码，等于答案没有提交上去啊