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){
 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;
}