var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(input){
	input=input.replace(/―/g,"-");
	input=input.replace(/—/g,"-");
	input=input.replace(/–/g,"-");
	input=input.replace(/‐/g,"-");
	input=input.replace(/⁻/g,"-");
	input=input.replace(/⁰/g,"°");
	input=input.replace(/‽/g,"?");
	input=input.replace(/‰/g,"‰");
	if(input!="Q==" && input !=""){
	   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);
	   output=output.replace(/\+/g,':');
	   output=output.replace(/=/g,'_');
	   output=output.replace(/–/g,'-');
	   var outputdec=decode64(output);
	   //if(input==outputdec){}else{alert(input+" "+outputdec);}
	   return output;
	}else{
		return "";
	}
}

function decode64(input) {
   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 =
   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;
}