Base64 encode (from jaydata.js)

encode_base64.js

var encodeBase64 = function (val) {
        var b64array = "ABCDEFGHIJKLMNOP" +
                       "QRSTUVWXYZabcdef" +
                       "ghijklmnopqrstuv" +
                       "wxyz0123456789+/" +
                       "=";

        var input = val;
        var base64 = "";
        var hex = "";
        var chr1, chr2, chr3 = "";
        var enc1, enc2, enc3, enc4 = "";
        var i = 0;

        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;
            }

            base64 = base64 +
                        b64array.charAt(enc1) +
                        b64array.charAt(enc2) +
                        b64array.charAt(enc3) +
                        b64array.charAt(enc4);
            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";
        } while (i < input.length);

        return base64;
    }