var curAd=0;
var timerID=null;
function changeAd()
{
	switch (curAd)
	{
		case 0:
			adLink.href="chamstore.asp";
			imgAd.src="images/ads/big/chamberstore.gif";
			break;
		case 1:
			adLink.href="http://www.chirhotek.com";
			imgAd.src="http://www.winthropchamber.com/images/ads/big/xp_banner2.jpg";
			break;
		case 2:
			adLink.href="advertise.asp";
			imgAd.src="images/ads/big/yourad_468x60.jpg";
			break;
		case 3:
			adLink.href="whyjoin.asp";
			imgAd.src="images/ads/big/join_rank.jpg";
			break;
		default:
			adLink.href="chamstore.asp";
			imgAd.src="images/ads/big/chamberstore.gif";
			break;
	}
	curAd+=1;
	if (curAd>3)
	{ curAd=0; }
	timerID = setTimeout("changeAd()", 10000)
}