Special characters in Flash/php mail form?

Hi,
Have made a very simple mail-form sent using php4 in a Flash-site. However the characters å, ä, ö and ’ (and possibly others) don’t display properly. How can I fix that? I have embedded all characters and they show right when writing the mail on the site. When importing text into Flash I would save the text as “text.txt” and format "Unicode (UTF
-8) but how to do this with the data that is sent? Anyone knows?