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 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 eDecode(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;

	}