Php (&mysql) & different char-sets

Is it possible to make three textareas on one page (of course it is, but read til the end, you`ll get the point) and let the user type into each box in a different language with different charsets. For example, lets say I want to insert three versions of one text on one page (without submitting the page first). In the first box, when i start writing, I can write with english char-set, as I move to the second box, I can write in russian and in the third box, the charset could already be swedish. Is it possible? If it is, how? And then I want to write it all to mysql database as well (keeping the correct char-sets). Thanks, Siim Einfeldt