[kh99]

You could try this: create a new plugin using hook location bbcode_create and this code:

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'
);

if you want to add a button in the editor for that code, you can go to the bbcode manager and create a bbcode with code alg. Set "Use {option}" to No and enter your button image, but you can put in whatever you want for the html replacement and the other settings, since they won't be used.