Update form not working

Hi,  

I am going crazy withis update code. I am trying to update a page which has data pulled from a database. But those fields are empty every time. Even when i fill it up and hit update i get an error. I am posting the code...hope it makes sense:


<?php require_once ('../includes/config.inc') ?>
<?php require_once ("../../mysql_connect.php") ?>
<?php include ("../includes/customer_header.html") ?>

<?php if(isset($_SESSION["username"]))
{
// get customerid from session
$cid = $_SESSION['customerid'];

if (isset($_POST['submit'])) { // Handle the form.

$message = NULL; // Create an empty new variable.

if (empty($_POST['first_name']) || empty($_POST['last_name']) || empty($_POST['business_name'])) {
$message .= "<span class='errormessage'><p align='left'>We could not process your request for the following reason(s):</p></span>";
}
//Check for first_name
if (empty($_POST['first_name'])) {
      $fn = False;
      $message .= "<span class='errormessage'><div align='left'>• Missing First Name.</div></span>";
} else {
      $fn = escape_data($_POST['first_name']);
}

//Check for last_name
if (empty($_POST['last_name'])) {
      $ln = False;
      $message .= "<span class='errormessage'><div align='left'>• Missing Last Name.</div></span>";
} else {
      $ln = escape_data($_POST['last_name']);
}

//Check for business_name
if (empty($_POST['business_name'])) {
      $bn = False;
      $message .= "<span class='errormessage'><div align='left'>• Missing Business Name.</div></span>";
} else {
      $bn = escape_data($_POST['business_name']);
}
      
      if ($fn && $ln && $bn) { // If everything's OK.

            // Make the query.
            $query = "UPDATE customers SET first_name='$fn', last_name='$ln', business_name='$bn' WHERE customerid='$cid'";            
            $result = @mysql_query ($query); // Run the query.
            if (mysql_affected_rows() == 1) { // If it ran OK.
                  
            $message .= "<span class='errormessage'><div align='center'>Your store info has been updated.</div></span>";
                        
                  } else { // If it did not run OK.
                        $message .= "<span class='errormessage'><div align='center'>Your store info could not be updated due to a system error. We apologize for any inconvenience.</div></span><p>" . mysql_error() . "</p>";
}

mysql_close(); //close database connection
}
} //end of submit conditional


// Retrieve the user's information.
$query = "SELECT * FROM customers WHERE customerid = '$cid'";            
$result = @mysql_query ($query); // Run the query.

if (mysql_num_rows($result) == 1) { // Valid user ID, show the form.

      // Get the user's information.
      $row = mysql_fetch_array($result, MYSQL_ASSOC);
      
echo ' <table border="0" width="100%" cellspacing="0" cellpadding="0">
      <tr>
            <td valign="top" width="370"><a href="index.php">Home</a> » <span class="content">Edit Store Info</span></td>
            <td valign="top">
            <p align="right"><span class="content">You are logged in as: <b>'.$_SESSION["username"];
echo '</b></span><br><a href="../logout.php">Logout</a></td>
      </tr>
</table>
                        <div align="center">';
                        if(isset($message)) echo $message;
                        echo' </div><br><br>
                        <div align="center">
                              <table border="0" width="70%" cellspacing="0" cellpadding="0">
                                    <tr>
                                          <td valign="top" align="right"><span class="darkbluesmall">All fields marked * are required.</span></td>
                                    </tr>
                              </table>
                        </div>
                        <form name="form1" method="post" action='.$_SERVER["PHP_SELF"];
                        echo '>
                        <div align="center">
                              <table class="inputform" borderColor="#f0f0f0" border="1">
                                    <tr class="rowcolor1"><td width="162">First Name:</td>
                                          <td><input type="text" name="first_name" class="textbox" maxlength="50" value="';
                        if(isset($_POST['first_name'])) echo $_POST['first_name'];
                        echo'"><span class="darkbluesmall"> *</span></td>
                                    </tr>
                                    <tr class="rowcolor2"><td width="162">Last Name:</td>
                                          <td><input type="text" name="last_name" class="textbox" maxlength="50" value="';
                        if(isset($_POST['last_name'])) echo $_POST['last_name'];
                        echo'"><span class="darkbluesmall"> *</span></td>
                                    </tr>
                                    <tr class="rowcolor1"><td width="162">Business Name:</td>
                                          <td><input type="text" name="business_name" class="textbox" maxlength="200" value="';
                        if(isset($_POST['business_name'])) echo $_POST['business_name'];
                        echo'"><span class="darkbluesmall"> *</span></td>
                                    </tr>
                                    <tr class="rowcolor2"><td width="162">Address:</td>
                                          <td><input type="text" name="address1" class="textbox" maxlength="200" value="';
                        if(isset($_POST['address1'])) echo $_POST['address1'];
                        echo'"><br><input type="text" name="address2" class="textbox" maxlength="200" value="';
                        if(isset($_POST['address2'])) echo $_POST['address2'];
                        echo'"></td>
                                    </tr>
                              </table>
                        </div>
                        <div align="center">
                              <table cellSpacing="0" cellPadding="0" width="70%" border="0">
                                    <tr>
                                          <td width="50%">
                                                <p align="right"><BR><input type="submit" name="submit" value="Edit Store" class="button">
                                                      </p>
                                          </td>
                                          <td width="1%"></td>
                                          <td width="49%">
                                                <p align="left"><BR><input type="reset" name="Submit2" value="Clear" class="button">
                                                </td>
                                    </tr>
                              </table>
                              </form>
                              </div> ';
                              } else { // Not a valid user ID.
                        echo '<h1 id="mainhead">Page Error</h1>
                        <p class="error">This page has been accessed in error.</p><p><br /><br /></p>';
                        }
                        
                        } else {
                        echo '<span class="content"><br><br><br><br><br><br><p align="center">You are not logged in.<br><br>To login click <a href="../login.php">here</a>.</p></span>';
            }
include ('../includes/customer_footer.html');
?>