Put this after the HTML and HEAD tags:

<P>
<SCRIPT language="Javascript">
<!--
// please keep these lines on when you copy the source
// made by: Nicolas - http://www.javascript-page.com
 

var currentdate = 0
var theranlink = " "
var core = 0

function StringArray (n) {
this.length = n;
for (var i =1; i <= n; i++) {
this[i] = ' '

}
}

link = new StringArray(5)

link[0] = 'http://www.yoursite.com/link1.html'
link[1] = 'http://www.yoursite.com/link2.html'
link[2] = 'http://www.yoursite.com/link3.html'
link[3] = 'http://www.yoursite.com/link4.html'
link[4] = 'http://www.yoursite.com/link5.html'
var ran = 60/link.length

function ranlink() {
currentdate = new Date()
core = currentdate.getSeconds()
adcore = Math.floor(core/ran)
core = adcore
theranlink = link[core]
self.location = theranlink
}

document.write("<a href='javascript:ranlink()'></a>")

var URL   = "javascript:ranlink()"
var speed = 0000


function reload() {
location = URL
}

setTimeout("reload()", speed);

//--> </SCRIPT>