Preceptor.util.String = {

	keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	encode64: function( 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 + this.keyStr.charAt(enc1) + this.keyStr.charAt(enc2) + 
	         this.keyStr.charAt(enc3) + this.keyStr.charAt(enc4);
	   } while (i < input.length);
	   
	   return output;
	},

	decode64: function( 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 = 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;
	},
	
	trim: function( input ){
		return input.replace(/^\s*|\s*$/g , "" );
	}
}