Text revelation effect

I would be glad if someone could take a look at my code and maybe improve it. It's an animation effect to gradually reveal text as if it were being decoded. I wouldn't mind if it could run with jQuery (if it's shorter or better). I uploaded it on jsbin.com. It's all about the effect and not about encryption or decryption.

I've written the following JS Code:

var got,
    chars,
    decrypted = document.getElementById("decoded"),
    encrypted = document.getElementById("encoded");
function change() {
    var randstring = "",
        rslength = chars.length - got.length,
        i;
    for (var x=0;x got.length) {
        setTimeout(change, 10);
    } else {
        encrypted.textContent = "";
    }
}
function startdecrypt() {
    chars = decrypted.textContent;
    decrypted.textContent = "";
    got = "";
    setTimeout(change, 10);
}
if (window.addEventListener) {
    window.addEventListener('load', startdecrypt, false); //W3C
} else {
    window.attachEvent('onload', startdecrypt); //IE
}

And this short HTML part:

Enjoy this effect!

var decrypted = document.getElementById("decoded");
var encrypted = document.getElementById("encoded");

function startdecrypt() {
    // Original text, split into an array and reversed (for faster pop())
    var originalText = decrypted.textContent.split('').reverse();
    var decryptedText = "";
    var i = 0;

    decrypted.textContent = "";

    var shuffleInterval = setInterval(function(){

      // Generate random strings. You can modify the generator function range
      // (Math.random()*(to-from+1)+from);
      var shuffledText = '';
      var j = originalText.length;
      while(j--) shuffledText += String.fromCharCode((Math.random()*94+33) | 0);
      // You can also use this generator to use only the remaining letters
      // while(j--) shuffledText += originalText[(Math.random()*j) | 0];

      // On every 10 cycles, remove a character from the original text to the decoded text
      if(i++ % 10 === 0) decryptedText += originalText.pop();

      // Display
      decrypted.textContent = decryptedText;
      encrypted.textContent = shuffledText;

      // Stop when done
      if(!shuffledText.length) clearInterval(shuffleInterval);

    // 50ms looks more dramatic
    },50);
}

if (window.addEventListener) {
    window.addEventListener('load', startdecrypt, false); //W3C
} else {
    window.attachEvent('onload', startdecrypt); //IE
}

Changes

-
Everything in one function

-
Simplified the code

-
Using setInterval rather than setTimeout. This is more efficient since you don't create timers everytime

-
More drama by adding random string generator, instead of just your original set of letters. This adds more mystery to the next letters.

-
In addition to the code, a monospace font would be more dramatic. It avoids the to-fro movement of the decoding text.

StackExchange Code Review Q#37411, answer score: 6