Delicious Randomization?

I haven’t found a plugin to do this, but I assume I could somehow change the code.

I have a list of about 100 links withing a Delicious tag. I want to have a list on my site to show a total of 20 links, randomized from this full list of 100.

This is roughly the code I was planning to use:

<div id="container">
<h2>my bookmarks</h2>
</div>
<script type="text/javascript"
src="http://del.icio.us/feeds/json/ALittlePieceoftheWorld?count=20"></script>
<script type="text/javascript">
function showImage(img){ return (function(){ img.style.display='inline'; }) }
var ul = document.createElement('ul')
for (var i=0, post; post = Delicious.posts[i]; i++) {
var li = document.createElement('li')
var a = document.createElement('a')
a.style.marginLeft = '20px'
var img = document.createElement('img')
img.style.position = 'absolute'
img.style.display = 'none'
img.height = img.width = 16
img.src = post.u.split('/').splice(0,3).join('/')+'/favicon.ico'
img.onload = showImage(img);
a.setAttribute('href', post.u)
a.appendChild(document.createTextNode(post.d))
li.appendChild(img)
li.appendChild(a)
ul.appendChild(li)
}
document.getElementById('container').appendChild(ul)
</script>

Is it possible to put some randomize info right into this?