How to add image links to random slideshow in Javascript

I am (very) novice and trying to help a friend with a website. I came across the javascript code below, but i'm struggling to make the images link to a separate webpage when clicked. I would appreaciate any help!

<script language="javascript">

var delay=1000 //set delay in miliseconds
var curindex=0

var randomimages=new Array()

randomimages[0]="1.jpg"
randomimages[1]="5.jpg"
randomimages[2]="2.jpg"
randomimages[3]="4.jpg"
randomimages[4]="3.jpg"
randomimages[5]="6.jpg"

var preload=new Array()

for (n=0;n<randomimages.length;n++)
{
preload[n]=new Image()
preload[n].src=randomimages[n]
}

document.write('<img name="defaultimage" 
src="'+randomimages[Math.floor(Math.random()*(randomimages.length))]+'">')

function rotateimage()
{

if (curindex==(tempindex=Math.floor(Math.random()*(randomimages.length)))){
curindex=curindex==0? 1 : curindex-1
}
else
curindex=tempindex

document.images.defaultimage.src=randomimages[curindex]
}

setInterval("rotateimage()",delay)

</script>