var Base64 = {

	keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

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

	   input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

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