Hellou all

i have a problem to convert data from utf8 to ascii.
I'm from slovakia and we use special characters like 'á é ¹ »' and so on.
But many times it is the same if u use 'á' or 'a'. So I need to translate
these special characters. Somebody told me to use function to_ascii() but
this function throws me an error : not supported encoding. There is about 50
characters that i need translate.

OS : debian
PostgreSQL : 8.1.3
configured with --enable-multibyte=UTF8

please help
thanx