<?php
query1=mysql_query("select * from slider_details where banner_id='1'") or die (mysql_error());
while($row1=mysql_fetch_array($query1))
{
?>
<tr>
<td><a class="btn btn-xs bg-danger" href="banner.php?bannerdelete=<?php echo $row1['id']; ?>"> Delete</td>
</tr>
<?php } ?>

extract($_REQUEST);
if(isset($bannerdelete)==true)
{
$query=mysql_query("delete from slider_details where id='$bannerdelete'") or die(mysql_error());
echo "<script type='text/javascript' src='swal.php'>myFn(); </script>";
}

<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert-dev.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert.css">
<script type='text/javascript'>
function myFn(){
swal({
title: 'Wow!',
text: 'Message!',
type: 'success',
confirmButtonText: 'OK'

});
}