All you want to do is to align the images to the left?
In functions.php under your admin folder find
PHP Code:
$bbcode = preg_replace("/(\[)(img)(])(\r\n)*([^\"".iif($allowdynimg,"","\?\&")."]*)(\[\/img\])/siU", "<img src=\"\\5\" border=\"0\" alt=\"\">", $bbcode);
and replace with
PHP Code:
$bbcode = preg_replace("/(\[)(img)(])(\r\n)*([^\"".iif($allowdynimg,"","\?\&")."]*)(\[\/img\])/siU", "<img src=\"\\5\" border=\"0\" alt=\"\" align=\"left\">", $bbcode);
and that's it.