// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

var Base64 = {
encode : function (input) {
		 var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
		 var output = "";
		 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;
			 }

			 output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + 
				 keyStr.charAt(enc3) + keyStr.charAt(enc4);
		 } while (i < input.length);

		 return output;
	 },

decode : function (input) {
		 var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
		 var output = "";
		 var chr1, chr2, chr3;
		 var enc1, enc2, enc3, enc4;
		 var i = 0;

		 // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
		 if(input==null || input==""){
			alert("보안정책에 위배되어 서비스가 종료되었습니다.");
	       history.go(1);
		 }
		 input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

		 do {
			 enc1 = keyStr.indexOf(input.charAt(i++));
			 enc2 = keyStr.indexOf(input.charAt(i++));
			 enc3 = keyStr.indexOf(input.charAt(i++));
			 enc4 = keyStr.indexOf(input.charAt(i++));

			 chr1 = (enc1 << 2) | (enc2 >> 4);
			 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			 chr3 = ((enc3 & 3) << 6) | enc4;

			 output = output + String.fromCharCode(chr1);

			 if (enc3 != 64) {
				 output = output + String.fromCharCode(chr2);
			 }
			 if (enc4 != 64) {
				 output = output + String.fromCharCode(chr3);
			 }
		 } while (i < input.length);

		 return output;
	 }
}
// EOF