<script type="text/javascript">
function show_alert()
{
  var r = confirm("Would you like to delete this user?");
  if (r == true)
  {
      <?php
      if(isset($_POST['user_id']) && ctype_digit($_POST['user_id']))
      {

        $db = new mysqli("99.99.99.999", "99.99.99.999", "99.99.99.999", "99.99.99.999");
        $statement = $db->prepare("DELETE FROM `afb2_accounts` WHERE `account_id` = '{$_POST['user_id']}' LIMIT 1");
        $statement->bind_param("user_id", $_POST['user_id']);
        $statement->execute();
      }
      ?>
  }
  else
  {
    alert("You pressed Cancel!");
  }
}
</script>

<!-- The action -->

<form method="post">
<input type="image" src="/img/delete_user32.ico" title="Delete" name="user_id" value="<?php echo $row['account_id'];?>" onclick="show_alert()"/>
</form>