Web editor useless in Poland...

Dear Sir or Madam,
i'd like to tell about trouble with Amaya, and problem is diacritics. 
Actually lack of them. Normally Alt+a, +c, +z, +x, +o, +e, +l, +n or +s, 
with Shift combination are used. We get: ą, ć, ż, ź, ó, ę, ł, ń and ś, 
upper case respectively. Only Alt+o works. I tried co configure it but 
without effect.
I tried it on WinXP Home SP2 only, will try it on Slackware 10 soon. Is 
there any hope to make it work with polish diacritcs? I really liked 
that editor but most of my webpage visitors would like polish language...
Your sincerely
Marcin Szczurowski