function base64_encode( data ) {

    var b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, enc="", tmp_arr =
[];



    if (!data) {

        return data;

    }



    data = this.utf8_encode(data+'');



    do {

        o1 = data.charCodeAt(i++);

        o2 = data.charCodeAt(i++);

        o3 = data.charCodeAt(i++);



        bits = o1<<16 | o2<<8 | o3;



        h1 = bits>>18 & 0x3f;

        h2 = bits>>12 & 0x3f;

        h3 = bits>>6 & 0x3f;

        h4 = bits & 0x3f;



        tmp_arr[ac++] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) +
b64.charAt(h4);

    } while (i < data.length);



    enc = tmp_arr.join('');



    switch( data.length % 3 ){

        case 1:

            enc = enc.slice(0, -2) + '==';

        break;

        case 2:

            enc = enc.slice(0, -1) + '=';

        break;

    }



    return enc;

}



function utf8_encode ( argString ) {

    var string = (argString+'').replace(/\r\n/g, "\n").replace(/\r/g, "\n");



    var utftext = "";

    var start, end;

    var stringl = 0;



    start = end = 0;

    stringl = string.length;

    for (var n = 0; n < stringl; n++) {

        var c1 = string.charCodeAt(n);

        var enc = null;



        if (c1 < 128) {

            end++;

        } else if((c1 > 127) && (c1 < 2048)) {

            enc = String.fromCharCode((c1 >> 6) | 192) +
String.fromCharCode((c1 & 63) | 128);

        } else {

            enc = String.fromCharCode((c1 >> 12) | 224) +
String.fromCharCode(((c1 >> 6) & 63) | 128) + String.fromCharCode((c1 & 63)
| 128);

        }

        if (enc !== null) {

            if (end > start) {

                utftext += string.substring(start, end);

            }

            utftext += enc;

            start = end = n+1;

        }

    }



    if (end > start) {

        utftext += string.substring(start, string.length);

    }



    return utftext;

}