TalkPHP - trying to post from one page to another and wont work

i have a table that displays the existing user names

Code:

<?php



include("config.php");





?>





<html>

<head>

<title>

</title>

<link href="stylesheets/style.css" type="text/css" rel="stylesheet" />

</head>

<body>

<form method="post" action="update_user.php">

<a href="adduser.php">Add User</a> <br>

<br>

<br>

<br>

<br>

<br>



<table>

<thead>

<tr>

<th>&nbsp;</th>

<th>Last Name</th>

<th>First Name</th>

<th>User Name</th>

<th>Level</th>

<th>Active</th>

</tr>

</thead>



<tbody>



<?php



#================================

#        populate all users names

#================================

$user_sql = mysql_query("select * from tbl_users order by id");



while($row = mysql_fetch_assoc($user_sql)) { 

echo "<tr>";

echo "<td><input type=\"radio\" name=\"rowid\" value=\"{$row['id']}\"></td>";

echo "<td>{$row['lname']}</td>";

echo "<td>{$row['fname']}</td>";

echo "<td>{$row['username']}</td>";

echo "<td>{$row['level']}</td>";

echo "<td>{$row['active']}</td>";

echo "</tr>";

}

?>



</tbody>

</table>

<input type="submit" name="btn_edit" value="Edit"> &nbsp; <input type="submit" name="btn_delete" value="Delete"><br>

<input type="hidden" name="txt_id" value="<?php echo $_POST['rowid']; ?>">





</form>

</body>

</html>

so when i make a selection and click on edit the next page doesnt show anything, how do request the post on the other page? i mean $_POST['value'] should do the trick but its not working what am i doing wrong??

here is the code for the other page

Code:

<?php



include("config.php");



$row_id = $_POST['rowid']; 





$sql = mysql_query("select * from tbl_users where id = '$row_id'");



?>















<html>

<head>

<title>

</title>

<link href="stylesheets/style.css" type="text/css" rel="stylesheet" />

</head>

<body>





<p>Last Name: </p>

<?php 



while($row = mysql_fetch_assoc($sql)) { 

?>

<p><input type="text" name="txt_lname" value="<?php echo $row['lname']; ?>"></p>



<p>First Name</p>

<p><input type="text" name="txt_fname" value="<?php echo $row['lname']; ?>"></p>

<p>User Name</p>

<p><input type="text" name="txt_username" value="<?php echo $row['lname']; ?>"></p>

<p>Level: <select><option>will do later</option></select></p>

<p>Active: <input type="checkbox" name="chk_active" <?php if($row['active'] == TRUE) { echo "checked"; } else { } ?> ></p>

<?php } ?>



<p><input type="submit" name="submit" value="Save"></p>





</body>

</html>