///////////////////////////////////////////////////////////////////////////////////
function utf16to8(str) 
{
    var out, i, len, c;

    out = [];
    len = str.length;
    for (i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if (c <= 0x007f) {
            out[i] = str.charAt(i);
        } else if (c > 0x07ff) {
            out[i] = String.fromCharCode(0xe0 | ((c >> 12) & 0x0f),
                                         0x80 | ((c >> 6) & 0x3f),
                                         0x80 | (c & 0x3f));
        } else {
            out[i] = String.fromCharCode(0xc0 | ((c >> 6) & 0x1f),
                                         0x80 | (c & 0x3f));
        }
    }
    return out.join('');
}

function utf8to16(str) 
{
    var out, i, j, len, c;
    var c2, c3;

    out = [];
    len = str.length;
    i = j = 0;
    while (i < len) {
        c = str.charCodeAt(i++);
        switch (c >> 4)
        { 
            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
            // 0xxx xxxx
            out[j++] = str.charAt(i - 1);
            break;
            case 12: case 13:
            // 110x xxxx   10xx xxxx
            c2 = str.charCodeAt(i++);
            out[j++] = String.fromCharCode(((c & 0x1f) << 6) |
                                                  (c2 & 0x3f));
            break;
            case 14:
            // 1110 xxxx  10xx xxxx  10xx xxxx
            c2 = str.charCodeAt(i++);
            c3 = str.charCodeAt(i++);
            out[j++] = String.fromCharCode(((c & 0x0f) << 12) |
                                                  ((c2 & 0x3f) << 6) |
                                                  (c3 & 0x3f));
            break;
        }
    }
    return out.join('');
}

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);

function __base64encode(str) 
{
	str=utf16to8(str);
    var out, i, len;
    var c1, c2, c3;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) 
    {
		c1 = str.charCodeAt(i++) & 0xff;
		if(i == len)
		{
			out += base64EncodeChars.charAt(c1 >> 2);
			out += base64EncodeChars.charAt((c1 & 0x3) << 4);
			out += "==";
			break;
		}
		c2 = str.charCodeAt(i++);
		if(i == len)
		{
			out += base64EncodeChars.charAt(c1 >> 2);
			out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
			out += base64EncodeChars.charAt((c2 & 0xF) << 2);
			out += "=";
			break;
		}
		c3 = str.charCodeAt(i++);
		out += base64EncodeChars.charAt(c1 >> 2);
		out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
		out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
		out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
}

function ___base64decode(str) 
{
    var c1, c2, c3, c4;
    var i, len, out;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) 
    {
		/* c1 */
		do 
		{
			c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
		} while(i < len && c1 == -1);
		if(c1 == -1) break;
		
		/* c2 */
		do 
		{
		 	c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
		} while(i < len && c2 == -1);
		if(c2 == -1) break;
		
		out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
		
		/* c3 */
		do 
		{
		 	c3 = str.charCodeAt(i++) & 0xff;
		 	if(c3 == 61)
				return out;
		 	c3 = base64DecodeChars[c3];
		} while(i < len && c3 == -1);
		if(c3 == -1) break;
		
		out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
		
		/* c4 */
		do 
		{
			c4 = str.charCodeAt(i++) & 0xff;
			if(c4 == 61)return out;
		 	c4 = base64DecodeChars[c4];
		} while(i < len && c4 == -1);
		if(c4 == -1) break;
		out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
    }
    return out;
}
function __base64decode(str)
{
	return utf8to16(___base64decode(str));
}