Sets the encoding for input/output documents. Returns
TRUE on success or
FALSE on failure.
Possible values for encoding are
ascii, latin0, latin1, raw, utf8, iso2022, mac, win1252, ibm858, utf16,
utf16le, utf16be, big5 and shiftjis
This function is only available in Tidy 1.0. It became obsolete in Tidy 2.0 and thus has been removed.