How to Keep Radio Button Value after Next/Prev page?

Question

 

  if(!isset($_GET['start'])){

$_GET['start'] = "undefined";

}

$start=$_GET['start'];// To take care global variable if OFF

if(!($start > 0)) {                         // This variable is set to zero for the first page

$start = 0;

}

$startpos = ($start -0);                

$limit = 1;

// No of records to be shown per page.

$currentpos = $startpos + $limit; 

$back = $startpos - $limit; 

$next = $startpos + $limit; 

  

        $countquery=" SELECT * FROM quiz  ";

$countresult=mysql_query($countquery);

echo mysql_error();

$totalrecords=mysql_num_rows($countresult);

  

 //$quiz_table = mysql_query("select * from quiz Limit 1");

?>

<form method="POST"  action="" onclick="">

 <table>

   

 <?php

 

 $quiz_table=" SELECT * FROM quiz ORDER BY qid limit $startpos, $limit ";

$result=mysql_query($quiz_table);

echo mysql_error();

 

while ($row = mysql_fetch_array($result)) 

{ 

  ?>

   <tr>

   <td><?php echo "$row[qid]"; ?></td>

   

   <td><?php echo "$row[Question]"; ?></td>

   </tr>

   <tr>

  

   <td><input type="radio" name="a" id="a" value="a"/>   <?php echo "$row[opt1]"; ?></td>

   <td><input type="radio" name="a" id="a" value="b"/>   <?php echo "$row[opt2]"; ?></td>

   <td><input type="radio" name="a" id="a" value="c"/>   <?php echo "$row[opt3]"; ?></td>

   <td><input type="radio" name="a" id="a" value="d"/>   <?php echo "$row[opt4]"; ?></td>

    

   </tr>

   <tr>

   <td><!--<input type="submit" name="smt" value="check"/>-->

   <?php

    if($back >=0) { 

print "<a href='onlineexam.php?start=$back'><font face='Verdana' size='2'><input type='button' name='prev' value='PREV'></font></a>"; 

}    

//echo "</td><td  align='right' width='10%'>";

///////////// If we are not in the last page then Next link will be displayed. Here we check that /////

if($currentpos < $totalrecords) {

                       

print "<a href='onlineexam.php?start=$next'><font face='Verdana' size='2'><input type='button' name='nxt' value='NEXT'></font></a>";

 

 

}

?></td>

<td><input type="submit" name="smt" value="Finish"/></td>

   </tr>

<?php

}

 

$quiz_table="SELECT * from quiz";

  

  $result=mysql_query($quiz_table);

 

    while ($row = mysql_fetch_array($result))   

{  

 

$id=$row['qid'];

$ques=$row['Question'];  

$op1=$row['opt1'];

$op2=$row['opt2'];

$op3=$row['opt3'];

$op4=$row['opt4']; 

$crt=$row['woptcode']; 

 

   if(isset($_POST['smt'])){

          $ans= $_POST['a'];

  if(isset($_POST['a'])){

 

if($crt == $ans ){

$mark=0;

$mark=$mark+1;

  

  mysql_query("INSERT INTO stuans(qid,Question,opt1,opt2,opt3,opt4,woptcode,stuanswer,mark)VALUES('$id','$ques','$op1','$op2','$op3', '$op4','$crt','$ans','$mark')");   

}else{

$mark=0;

mysql_query("INSERT INTO stuans(qid,Question,opt1,opt2,opt3,opt4,woptcode,stuanswer,mark)VALUES('$id','$ques','$op1','$op2','$op3', '$op4','$crt','$ans','$mark')");   

}

 } 

}  

 }