bildspel i php?

<?php
if(!isset($_GET['action']))

	{$action = 's1';
		} else {
	$action = $_GET['action'];
	}

?>

            <a href="index.php?action=s1">slide1</a>
            <a href="index.php?action=s2">slide2</a>

            	                <img src="images/slide/<?php
				if($action == 's1') {echo 'slide1';} 
				elseif($action == 's2') {echo 'slide2';} 
				elseif($action == 's3') {echo 'slide3';} 
				elseif($action == 's4') {echo 'slide4';}
				elseif($action == 's5') {echo 'slide5';}
				elseif($action == 's6') {echo 'slide6';}
				?>.png" />