Something

function _rkRightSideRandImage($directory) {
	$d = dir($directory);
	$i = 0;
	while(false !== ($e = $d->read()))
		if($e != '.' || $e != '..') {
			$imageList[$i] = $e;
		}

	$rand = array_rand($imageList);
	return $imageList[$rand];
}