Fencer: nice!

maybe another idea would be to have the poster place the code in between a certain code which then would be parsed by the site when someone reads it and shown in the language they have selected to view the site

for example you post [lang]"diky"[/lang] and i would read "dank u wel"
(the site will see you write in czech as you have czech selected as your language, so it looks up your text in the czech list, and then translates it to dutch as thats the language i have selected

it might be tough though as the site wont find "diky" in the czech list as its missing some accents .. and therefore would still show it as "diky" to me as its unknown to the site :)