encdec.js

function encrypt(s, pw) {
  var a=0, i=0, myString='', textLen=s.length, pwLen=pw.length;
  
  for (i=0; i<textLen; i++) {
  	a = parseInt(s.charCodeAt(i), 10);
		a = a^(pw.charCodeAt(i % pwLen));
		a = a + "";
		while (a.length<3) {
			a='0'+a;
		}
		myString += a; 
    }
    return myString;       // returned encrypted string
  }
 
function decrypt(s, pw) {
  var myString='',
  	a=0, i=0, pwLen=pw.length,
  	textLen=s.length, myHolder="";

  while(i < s.length-2) {
    myHolder = s.charAt(i) + s.charAt(i+1) + s.charAt(i+2);
    if (s.charAt(i) === '0') {
      myHolder = s.charAt(i+1) + s.charAt(i+2); 
    }
    if ((s.charAt(i) ==='0') && (s.charAt(i+1) === '0')) {
      myHolder = s.charAt(i+2); 
    }
    a = parseInt(myHolder, 10);
    a = a^(pw.charCodeAt((i/3) % pwLen));
    myString += String.fromCharCode(a);
    i+=3;
    }
   return myString;     // returned decrypted string
  }