function bb2html($str)
{
    $str = htmlspecialchars($search, ENT_NOQUOTES);
    $find = array('#\[ *b *\](.+)\[ */b *\]#is',
        '#\[ *i *\](.+)\[ */i *\]#is',
        '#\[ *u *\](.+)\[ */u *\]#is',
        '#\[ *s *\](.+)\[ */s *\]#is',
        '#\[ *(colou?r) *= *#([a-f0-9]{3}|[a-f0-9]{6}) *\](.+)[ *\1 *\]#is',
        '#\[ *quote *\](.+)\[ */quote *\]#is');
    $replace = array('<b>\1</b>',
        '<i>\1</i>',
        '<u>\1</u>',
        '<s>\1</s>',
        '<span style="color: #\2">\3</span>',
        '<table width="100%" bgcolor="lightgray"><tr><td bgcolor="white">\1</td></tr></table>');

    $str = preg_replace($find, $replace, $str);
    return $str;
}