var END_OF_INPUT = -1; 
var base64Chars = new Array( 
 'A','B','C','D','E','F','G','H', 
 'I','J','K','L','M','N','O','P', 
 'Q','R','S','T','U','V','W','X', 
 'Y','Z','a','b','c','d','e','f', 
 'g','h','i','j','k','l','m','n', 
 'o','p','q','r','s','t','u','v', 
 'w','x','y','z','0','1','2','3', 
 '4','5','6','7','8','9','+','/' 
); 
var reverseBase64Chars = new Array(); 
for (var i=0; i < base64Chars.length; i++){ 
 reverseBase64Chars[base64Chars[i]] = i; 
} 
var base64Str; 
var base64Count; 
function setBase64Str(str){ 
 base64Str = str; 
 base64Count = 0; 
} 
function readBase64(){  
 if (!base64Str) return END_OF_INPUT; 
 if (base64Count >= base64Str.length) return END_OF_INPUT; 
 var c = base64Str.charCodeAt(base64Count) & 0xff; 
 base64Count++; 
 return c; 
} 
function encodeBase64(str){ 
 setBase64Str(str); 
 var result = ''; 
 var inBuffer = new Array(3); 
 var lineCount = 0; 
 var done = false; 
 while (!done && (inBuffer[0] = readBase64()) != END_OF_INPUT){ 
 inBuffer[1] = readBase64(); 
 inBuffer[2] = readBase64(); 
 result += (base64Chars[ inBuffer[0] >> 2 ]); 
 if (inBuffer[1] != END_OF_INPUT){ 
 result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30) | (inBuffer[1] >> 4) ]); 
 if (inBuffer[2] != END_OF_INPUT){ 
 result += (base64Chars [((inBuffer[1] << 2) & 0x3c) | (inBuffer[2] >> 6) ]); 
 result += (base64Chars [inBuffer[2] & 0x3F]); 
 } else { 
 result += (base64Chars [((inBuffer[1] << 2) & 0x3c)]); 
 result += ('='); 
 done = true; 
 } 
 } else { 
 result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30)]); 
 result += ('='); 
 result += ('='); 
 done = true; 
 } 
 lineCount += 4; 
 if (lineCount >= 76){ 
 result += ('\n'); 
 lineCount = 0; 
 } 
 } 
 return result; 
} 
function readReverseBase64(){  
 if (!base64Str) return END_OF_INPUT; 
 while (true){  
 if (base64Count >= base64Str.length) return END_OF_INPUT; 
 var nextCharacter = base64Str.charAt(base64Count); 
 base64Count++; 
 if (reverseBase64Chars[nextCharacter]){ 
 return reverseBase64Chars[nextCharacter]; 
 } 
 if (nextCharacter == 'A') return 0; 
 } 
 return END_OF_INPUT; 
} 
function ntos(n){ 
 n=n.toString(16); 
 if (n.length == 1) n="0"+n; 
 n="%"+n; 
 return unescape(n); 
} 
function decodeBase64(str){ 
 setBase64Str(str); 
 var result = ""; 
 var inBuffer = new Array(4); 
 var done = false; 
 while (!done && (inBuffer[0] = readReverseBase64()) != END_OF_INPUT 
 && (inBuffer[1] = readReverseBase64()) != END_OF_INPUT){ 
 inBuffer[2] = readReverseBase64(); 
 inBuffer[3] = readReverseBase64(); 
 result += ntos((((inBuffer[0] << 2) & 0xff)| inBuffer[1] >> 4)); 
 if (inBuffer[2] != END_OF_INPUT){ 
 result += ntos((((inBuffer[1] << 4) & 0xff)| inBuffer[2] >> 2)); 
 if (inBuffer[3] != END_OF_INPUT){ 
 result += ntos((((inBuffer[2] << 6) & 0xff) | inBuffer[3])); 
 } else { 
 done = true; 
 } 
 } else { 
 done = true; 
 } 
 } 
 return result; 
} 
var digitArray = new Array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'); 
function toHex(n){ 
 var result = '' 
 var start = true; 
 for (var i=32; i>0;){ 
 i-=4; 
 var digit = (n>>i) & 0xf; 
 if (!start || digit != 0){ 
 start = false; 
 result += digitArray[digit]; 
 } 
 } 
 return (result==''?'0':result); 
} 
function pad(str, len, pad){ 
 var result = str; 
 for (var i=str.length; i<len; i++){ 
 result = pad + result; 
 } 
 return result; 
}