function setAdvertStyles(){
	if(!document.getElementById&&document.all){
	var adv1=document.all('advertset1');
	var adv2=document.all('advertset2');
	var adv3=document.all('advertset3');
	var adv4=document.all('advertset4');
	var adv5=document.all('advertset5');
	}
	else{
		var adv1=document.getElementById('advertset1');
		var adv2=document.getElementById('advertset2');
		var adv3=document.getElementById('advertset3');
		var adv4=document.getElementById('advertset4');
		var adv5=document.getElementById('advertset5');
	}

	adv1.style.visibility='visible';
	adv1.style.display='block';
	adv2.style.visibility='hidden';
	adv2.style.display='none';
	adv3.style.visibility='hidden';
	adv3.style.display='none';
	adv4.style.visibility='hidden';
	adv4.style.display='none';
	adv5.style.visibility='hidden';
	adv5.style.display='none';
}

function rotateAds(){
	//alert("Rotate!");
	
	if(!document.getElementById&&document.all){
		var adv1=document.all('advertset1');
		var adv2=document.all('advertset2');
		var adv3=document.all('advertset3');
		var adv4=document.all('advertset4');
		var adv5=document.all('advertset5');
	}
	else{
		var adv1=document.getElementById('advertset1');
		var adv2=document.getElementById('advertset2');
		var adv3=document.getElementById('advertset3');
		var adv4=document.getElementById('advertset4');
		var adv5=document.getElementById('advertset5');
	}
	
	//alert(adv1.style.display);
	
	if(adv1.style.display=='block'){
		//alert('adv1');
		adv1.style.visibility='hidden';
		adv1.style.display='none';
		adv2.style.visibility='visible';
		adv2.style.display='block';
		adv3.style.visibility='hidden';
		adv3.style.display='none';
		adv4.style.visibility='hidden';
		adv4.style.display='none';
		adv5.style.visibility='hidden';
		adv5.style.display='none';
	}
	else if(adv2.style.display=='block'){
		//alert('adv2');
		adv1.style.visibility='hidden';
		adv1.style.display='none';
		adv2.style.visibility='hidden';
		adv2.style.display='none';
		adv3.style.visibility='visible';
		adv3.style.display='block';
		adv4.style.visibility='hidden';
		adv4.style.display='none';
		adv5.style.visibility='hidden';
		adv5.style.display='none';
	}
	else if(adv3.style.display=='block'){
		//alert('adv3');
		adv1.style.visibility='hidden';
		adv1.style.display='none';
		adv2.style.visibility='hidden';
		adv2.style.display='none';
		adv3.style.visibility='hidden';
		adv3.style.display='none';
		adv4.style.visibility='visible';
		adv4.style.display='block';
		adv5.style.visibility='hidden';
		adv5.style.display='none';
	}
	else if(adv4.style.display=='block'){
		//alert('adv3');
		adv1.style.visibility='hidden';
		adv1.style.display='none';
		adv2.style.visibility='hidden';
		adv2.style.display='none';
		adv3.style.visibility='hidden';
		adv3.style.display='none';
		adv4.style.visibility='hidden';
		adv4.style.display='none';
		adv5.style.visibility='visible';
		adv5.style.display='block';
	}
	else if(adv5.style.display=='block'){
		//alert('adv3');
		adv1.style.visibility='visible';
		adv1.style.display='block';
		adv2.style.visibility='hidden';
		adv2.style.display='none';
		adv3.style.visibility='hidden';
		adv3.style.display='none';
		adv4.style.visibility='hidden';
		adv4.style.display='none';
		adv5.style.visibility='hidden';
		adv5.style.display='none';
	}
	
	InitializeTimer();
}

<!--
var secs
var timerID = null
var timerRunning = false
var delay = 1000

function InitializeTimer()
{
    // Set the length of the timer, in seconds
    secs = 10
    StopTheClock()
    StartTheTimer()
}

function StopTheClock()
{
    if(timerRunning)
        clearTimeout(timerID)
    timerRunning = false
}

function StartTheTimer()
{
    if (secs==0)
    {
        StopTheClock()
        // Here's where you put something useful that's
        // supposed to happen after the allotted time.
        // For example, you could display a message:
        rotateAds();
    }
    else
    {
        //self.status = secs+' - this is a development message. Countdown to advert rotation.';
        secs = secs - 1
        timerRunning = true
        timerID = self.setTimeout("StartTheTimer()", delay)
    }
}