[kingady]

	else if (!empty($thumbnail['filedata']))
				{
					// write out thumbnail now
					$filename = fetch_attachment_path($posterid, $attachmentid, true);
					$fp = fopen($filename, 'wb');
					fwrite($fp, $thumbnail['filedata']);
					fclose($fp);
					unset($thumbnail);
/* WATERMARK by Robbban*/
					$wmark = "http://www.hl2insider.net/forums/watermark.png";
	   				
					$im = imagecreatefromjpeg(fetch_attachment_path($posterid, $attachmentid));
					imagealphablending($im, true);

	    				$watermark = imagecreatefrompng($wmark);

					$y = imagesy($im) - imagesy($watermark);

					$w = imagesx($watermark);
					$h = imagesy($watermark);

					imagecopy($im, $watermark, 0, $y, 0, 0, $w, $h);
					imagejpeg($im, fetch_attachment_path($posterid, $attachmentid), 100);
				}
			}

correct?