var billboard = new Array ();
billboard[0] = new Image ();
billboard[0].src = "../images/default/img1000_1.jpg";
billboard[1] = new Image ();
billboard[1].src = "../images/default/img1000_2.jpg";
billboard[2] = new Image ();
billboard[2].src = "../images/default/img1000_3.jpg";
billboard[3] = new Image ();
billboard[3].src = "../images/default/img1000_4.jpg"; 

if (document.images) {
	var boardNum = 0;
	var boardSpeed = 5000;
}

function rotateBoard () {
	if (boardNum < (billboard.length - 1)) {
		boardNum++;
	}
	else {
		boardNum = 0;
	}
	document.billboard.src = billboard[boardNum].src;
	setTimeout ('rotateBoard()', boardSpeed);
}