Mini FrontPage - missing letters

Sorry, was visiting my family this weekend.
You can have it, just let me know where to send it - announcing it here wouldn't be wise thing I guess.

Neat. Here are the details.

Yesterday I decided to do it all over again. Installed Joomla, plugins and put some articles. The same thing happened. So I sat down, opened some 'php for dummies' sites and I've been trying to find out what was going on.
Apparently there's problem with polish characters (ąćęłńóśźż).
I found that this part of fix_tags function was the source of problem:
$result .= $matches[1];
$html = mb_substr($html, strlen($matches[0]));
It appears that in $matches[0], polish characters were counted double (perhaps codepage issue) - so the more polish characters before tag, the more characters were deleted right after tag.
I changed it this way:
$result .= $matches[1];
$toob = stristr($html, ">");
$html = mb_substr($toob, 1);
Now it seems to work but I'm not familiar with php so I guess it might cause some other issues and could be done far better. I'm sure I won't be using '>' in text so it will always be html tag (I know it would mess up pretty well if I used it).

Please let me know if you think there's better solution.

Hi Toobkin, I'm not really sure whether this will have any impact to other part or not, but basically you can use that code.