<script>

var clockid=new Array()
var clockidoutside=new Array()
var i_clock=-1
var thistime= new Date()
var hours='1'
var minutes='1'
var seconds='1'
if (eval(hours) <10) {hours="0"+hours}
if (eval(minutes) < 10) {minutes="0"+minutes}
if (seconds < 10) {seconds="0"+seconds}
var thistime = hours+":"+minutes+":"+seconds
	
function writeclock() {
	i_clock++
	if (document.all || document.getElementById || document.layers) {
		clockid[i_clock]="clock"+i_clock
		document.write("<font family=arial size=2><span id='"+clockid[i_clock]+"' style='position:relative'>"+thistime+"</span></font>")
	}
}

function clockon() {
	thistime= new Date()
	hours=thistime.getHours()
	minutes=thistime.getMinutes()
	seconds=thistime.getSeconds()
	if (eval(hours) <10) {hours="0"+hours}
	if (eval(minutes) < 10) {minutes="0"+minutes}
	if (seconds < 10) {seconds="0"+seconds}
	thistime = hours+":"+minutes+":"+seconds
		
	if (document.all) {
		for (i=0;i<=clockid.length-1;i++) {
			var thisclock=eval(clockid[i])
			thisclock.innerHTML=thistime
		}
	}
	
	if (document.getElementById) {
		for (i=0;i<=clockid.length-1;i++) {
			document.getElementById(clockid[i]).innerHTML=thistime
		}
	}
	var timer=setTimeout("clockon()",1000)
}
window.onload=clockon
</script>

Es ist <script>writeclock()</script> Uhr