adImages = new Array ("images/contact1.jpg","images/contact2.jpg","images/contact3.jpg","images/contact4.jpg");
thisAd=0;
imgCt = adImages.length;

function rotate() {
	if (document.images) {
	thisAd++;
		if (thisAd == imgCt) {
			thisAd = 0;
		}
	document.adBanner.src=adImages[thisAd];
	setTimeout("rotate()",3*1000);
	}
}