PHP Deleting Image In MySQL

<!-- Modal -->
<div id="delete<?php  echo $id;?>" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-header">
<h3 id="myModalLabel">Delete</h3>
</div>
<div class="modal-body">
<div class="alert alert-danger">
<?php if($row['image_location'] != ""): ?>
<img src="uploads/<?php echo $row['image_location']; ?>" width="100px" height="100px" style="border:1px solid #333333;">
<?php else: ?>
<img src="images/default.png" width="100px" height="100px" style="border:1px solid #333333; margin-left:15px;">
<?php endif; ?>
<b style="color:blue; margin-left:25px; font-size:30px;"><?php echo $row['first_name']." ".$row['last_name']; ?></b>
<br />
<p style="font-size: larger; text-align: center;">Are you Sure you want to Delete?</p>
</div>
<hr>
<div class="modal-footer">
<button class="btn btn-inverse" data-dismiss="modal" aria-hidden="true">No</button>
<a href="delete.php<?php echo '?tbl_image_id='.$id; ?>" class="btn btn-danger">Yes</a>
</div>
</div>
</div>

<?php
require_once('db.php');
 
$get_id=$_GET['tbl_image_id'];
 
// sql to delete a record
$sql = "Delete from tbl_image where tbl_image_id = '$get_id'";
 
// use exec() because no results are returned
$conn->exec($sql);
header('location:index.php');
?>