window.onload = rotate;

var thisAd = 0;

function rotate() {
	var adImages = new Array("images/01.jpg", "images/02.jpg", "images/04.jpg","images/05.jpg","images/06.jpg","images/07.jpg","images/08.jpg","images/09.jpg","images/10.jpg","images/11.jpg","images/12.jpg","images/13.jpg","images/14.jpg","images/15.jpg","images/16.jpg","images/17.jpg","images/18.jpg");

	thisAd++;
	if (thisAd == adImages.length) {
		thisAd = 0;
	}
	document.getElementById("headerimage").src = adImages[thisAd];

	setTimeout(rotate, 5 * 1000);
}