Add letters in memberlist?

How do I extend the searchable letters in the memberlist? Now its only A-Z.
In the swedish alphabet it is three more letters after Z... (Å, Ä, Ö...)

In the "memberlist.php" there is a string wich look like this: for ($i=65;$i<91;$i++) {

65 stands for 'A' and 90 for 'Z'. How do I add the ascii-code 142, 143 and 153? so the hack will work as I wish?

Regards
Christer

[Anders P]

I would like to know this as well

/Anders