function base64_encode(data)
{

    // http://kevin.vanzonneveld.net
    // +   original by: Tyler Akins (http://rumkin.com)
    // +   improved by: Bayron Guevara
    // +   improved by: Thunder.m
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Pellentesque Malesuada
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // -    depends on: utf8_encode
    // *     example 1: base64_encode('Kevin van Zonneveld');
    // *     returns 1: 'S2V2aW4gdmFuIFpvbm5ldmVsZA=='
    // mozilla has this native
    // - but breaks in 2.0.0.12!
    //if (typeof this.window['atob'] == 'function')
    //{
    //    return atob(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 + '');

 

      // pack three octets into four hexets

    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;

 

        // use hexets to index into b64, and append result to encoded string

        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 )
{

    // http://kevin.vanzonneveld.net
    // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: sowberry
    // +    tweaked by: Jack
    // +   bugfixed by: Onno Marsman
    // +   improved by: Yves Sucaet
    // +   bugfixed by: Onno Marsman
    // +   bugfixed by: Ulrich
    // *     example 1: utf8_encode('Kevin van Zonneveld');
    // *     returns 1: 'Kevin van Zonneveld'


    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;

}