กำลังทำข้อสอบแบบ Random คะ และพอส่มขึ้นมาให้ผู้ใช้ทำ ถ้าผู้ใช้ทำข้อสอบไม่ครบทุกข้อ จะมีข้อความแจ้งเตือนจึ้นมา "กรูณาทำให้ครบทุกข้อ" รบกวนพี่ช่วยทำการเช็ค radioให้หน่อยคะ

<form method="post" action="r_check_befor.php" ><div align="left">
<?
$number=1;
require"connect_db.php";
$sql="select * from test where chapter =1 and type = 1 order by rand() limit 0,6"; //สุ่มทีละ6 ข้อ
$result=mysql_db_query("$dbname",$sql);
while ($r=mysql_fetch_array($result)){
$id=$r[id];
$question=$r[question];
$choice1=$r[choice1];
$choice2=$r[choice2];
$choice3=$r[choice3];
$choice4=$r[choice4];

echo"<b>$number) $question</b><br>
&nbsp;&nbsp;&nbsp;1&nbsp;<input type='radio'  name='select_$id' value='1'>
$choice1<br>
&nbsp;&nbsp;&nbsp;2&nbsp;<input type='radio' name='select_$id' value='2'>
$choice2<br>
&nbsp;&nbsp;&nbsp;3&nbsp;<input type='radio' name='select_$id' value='3'>
$choice3<br>
&nbsp;&nbsp;&nbsp;4&nbsp;<input type='radio' name='select_$id' value='4'>
$choice4

<input type='hidden' name='total_question[]' value='$id'/><br>
<hr>";
$number++;
}

$number=7;
require"connect_db.php";
$sql="select * from test where chapter =2 and type = 1 order by rand() limit 0,6";
$result=mysql_db_query("$dbname",$sql);
while ($r=mysql_fetch_array($result)){
$id=$r[id];
$question=$r[question];
$choice1=$r[choice1];
$choice2=$r[choice2];
$choice3=$r[choice3];
$choice4=$r[choice4];

echo"<b>$number) $question</b><br>
&nbsp;&nbsp;&nbsp;1<input type='radio' name='select_$id' value='1'>
$choice1<br>
&nbsp;&nbsp;&nbsp;2<input type='radio' name='select_$id' value='2'>
$choice2<br>
&nbsp;&nbsp;&nbsp;3<input type='radio' name='select_$id' value='3'>
$choice3<br>
&nbsp;&nbsp;&nbsp;4<input type='radio' name='select_$id' value='4'>
$choice4
<input type='hidden' name='total_question[]' value='$id'<br>
<hr>";
$number++;
}


?>
          <input type='hidden' name='id_s' value='<?=$row_show['ID_score']?>' />&nbsp;&nbsp;&nbsp;&nbsp;
          &nbsp;&nbsp;&nbsp;&nbsp;<input type="submit" name="submit" value="ดูคะแนน">&nbsp;&nbsp;
          <input type="reset" value="รีเซท">
        </div>
</form>