GDlib thumbnail problem

Kode 

if($_GET['action'] == "upload")
{
	$filtype = $_FILES['fil']['type'];
	$filnavn = $_FILES['fil']['name'];
	$filTmpNavn = $_FILES['fil']['tmp_name'];
	
	
	if($filtype == "image/jpeg" || $filtype == "image/jpg" || $filtype == "image/gif" || $filtype == "image/png")
	{
	$target = "uploads/";
	$target = $target . basename($filnavn);

		if(move_uploaded_file($filTmpNavn, $target))
		{
			
			list($height,$width) = getimagesize("./uploads/" . $filnavn);

			$ny_width = 100;
			$ny_height = round(($ny_width/$height)*$width);
			
			if($filtype == "image/jpeg") {
				$src = imagecreatefromjpeg("./uploads/" . $filnavn);
				$destination = imagecreatetruecolor($ny_width,$ny_height);
				imagecopyresampled($destination, $src, 0, 0, 0, 0, $ny_width, $ny_height, $width, $height);			
				imagejpeg($destination, "./uploads/thumb/tn_$filnavn");
				imagedestroy($src);
			}
			elseif($filtype == "image/png") {
				$src = imagecreatefrompng("./uploads/" . $filnavn);
				$destination = imagecreatetruecolor($ny_width,$ny_height);
				imagecopyresampled($destination, $src, 0, 0, 0, 0, $ny_width, $ny_height, $width, $height);
				imagepng($destination, "./uploads/thumb/tn_$filnavn");	
				imagedestroy($src);	
			}
			elseif($filtype == "image/gif")
			{
				$src = imagecreatefromgif("./uploads/" . $filnavn);
				$destination = imagecreatetruecolor($ny_width,$ny_height);
				imagecopyresized($destination, $src, 0, 0, 0, 0, $ny_width, $ny_height, $width, $height);
				imagegif($destination, "./uploads/thumb/tn_" . $filnavn);	
				imagedestroy($src);
			}
			
		
			
			
		}
		else
		{
			echo "Der er sket en fejl, prøv igen.";
		}
}
else {
	echo "forkert type fil, du må kun uploade billeder";
}
}