[kh99]

Yeah, I got thinking about removing quotes and forgot that a single quote was part of the "code". So anyway, try this:

if (!function_exists('handle_bbcode_alg'))
{
	function handle_bbcode_alg(&$parser, $code, $option='')
	{
		$param = str_replace(array(' ', "'"), array('_', '-'), $code);
		return '<a href="http://alg.garron.us/?alg='.$param.'">'.$code.'</a>';
	}
}
$this->tag_list['no_option']['alg'] = array(
	'callback' => 'handle_external',
	'strip_empty' => true,
	'stop_parse' => true,
	'disable_smilies' => true,
	'disable_wordwrap' => true,
	'strip_space_after' => 1,
	'external_callback' => 'handle_bbcode_alg'
);