JS utf-8 to windows-1251 string converter

utf8-win1251

//utf8 to 1251 converter (1 byte format, RU/EN support only + any other symbols) by drgluck
function utf8_decode (aa) {
    var bb = '', c = 0;
    for (var i = 0; i < aa.length; i++) {
        c = aa.charCodeAt(i);
        if (c > 127) {
            if (c > 1024) {
                if (c == 1025) {
                    c = 1016;
                } else if (c == 1105) {
                    c = 1032;
                }
                bb += String.fromCharCode(c - 848);
            }
        } else {
            bb += aa.charAt(i);
        }
    }
    return bb;
}