data not display in textbox

Question

<?php

$host="localhost"; // Host name 

$username="root"; // Mysql username 

$password=""; // Mysql password 

$db_name="test"; // Database name 

$tbl_name="ques"; // Table name 

$con = mysql_connect("$host","$username")or die("cannot connect"); 

mysql_select_db("$db_name")or die("cannot select DB");

 

$quesid=$_POST['quesID'];

$question =$_POST['questions'];

if ($quesid <> "")

{

$sql = "SELECT * FROM $tbl_name  WHERE quesID = '$quesid'";

while($result= mysql_fetch_assoc($sql))

{

$quesi = $result['quesID'];

$ques = $result['ques'];

$op1 = $result['op1'];

$op2 = $result['op2'];

$op3 = $result['op3'];

$op4 = $result['op4'];

$exans = $result['exans'];

}

}

else

{

$sql = "SELECT * FROM $tbl_name  WHERE questions='$question'";

while($result= mysql_fetch_assoc($sql))

{

$quesi = $result['quesID'];

$ques = $result['ques'];

$op1 = $result['op1'];

$op2 = $result['op2'];

$op3 = $result['op3'];

$op4 = $result['op4'];

$exans = $result['exans'];

}

}

?> 

<p>&nbsp;</p>

<form id="comForm" name="comForm" method="post" action="updateque.php">

 

  <table width="300" border="0" align="center" cellpadding="2" cellspacing="0">

    <tr>

<td ><b>Question ID :</b></td>

<td ><input name="quesid" value=<?php echo "$quesi" ?>" />  </td>

    </tr>

    <tr>

<td ><b>Question  :</b></td>

<td ><input name="ques" value="<?php echo "$ques" ?>" />  </td>

    </tr>

 <tr>

<td ><b>Option 1 :</b></td>

<td ><input name="op1" value="<?php echo "$op1" ?>" />  </td>

 </tr>

 <tr>

<td ><b>Option 2 :</b></td>

<td ><input name="op2" value="<?php echo "$op2" ?>" />  </td>

 </tr>

 <tr>

<td ><b>Option 3 :</b></td>

      <td ><input name="op3" value="<?php echo "$op3" ?>" />  </td>

    </tr>

<tr>

<td ><b>Option 4 :</b></td>

      <td ><input name="op4" value="<?php echo "$op4" ?>" />  </td>

    </tr>

<tr>

<td ><b>Right Answer :</b></td>

      <td ><input name="exans" value="<?php echo "$exans" ?>" />  </td>

    </tr>

</table>

</form>