var base64 ={
	encode:function(input){
        var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
        var result = '';
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input;
        do {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
           result += chars.charAt(enc1) + chars.charAt(enc2) + chars.charAt(enc3) + chars.charAt(enc4);
        } while (i < input.length);
    
        return result;
    },
    decode:function(input){
        var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
        var result = '';
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        var input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
        do {
            enc1 = chars.indexOf(input.charAt(i++));
            enc2 = chars.indexOf(input.charAt(i++));
            enc3 = chars.indexOf(input.charAt(i++));
            enc4 = chars.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            result += String.fromCharCode(chr1);
            if (enc3 != 64) {
                result += String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                result += String.fromCharCode(chr3);
            }
        } while (i < input.length);
         return result;
    }
}