<body>
<script language="javascript">



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

var randomimages=new Array()

randomimages[0]="pic1.jpg"
randomimages[1]="pic5.jpg"
randomimages[2]="pic2.jpg"
randomimages[3]="pic4.jpg"
randomimages[4]="pic3.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>

</body>