Oops, I didn't test this any further than Preview. Change the hack to :
PHP Code:
//########### CLICKABLE LINK HACK ###########
require_once(DIR . '/includes/functions_newpost.php');
$code = convert_url_to_bbcode($code);
$n = preg_match_all('#\[url\].*\[/url\]#U', $code, $matches);
foreach($matches[0] AS $match)
{
$string = str_replace('[url]', '', $match);
$string = str_replace('[/url]', '', $string);
$html_url = '<a href="' . $string . '" target="_blank">' . $string . '</a>';
$code = str_replace($match, $html_url, $code);
}
//########## /CLICKABLE LINK HACK ###########