function changeBanner() {
    document.getElementById('bottomImage3').style.backgroundImage = 'url(/gfx/sil.php?rnd=' + (Math.random() * 1000) + ')';

		if(brand == '') {
	   if(document.getElementById('bottomImage2').style.backgroundImage == 'url(/gfx/silhoutte2-3.gif)') {
				document.getElementById('bottomImage2').style.backgroundImage = 'url(/gfx/silhoutte2.gif)';
	   } else if(document.getElementById('bottomImage2').style.backgroundImage == 'url(/gfx/silhoutte2-2.gif)') {
				document.getElementById('bottomImage2').style.backgroundImage = 'url(/gfx/silhoutte2-3.gif)';
	   } else {
				document.getElementById('bottomImage2').style.backgroundImage = 'url(/gfx/silhoutte2-2.gif)';
			}
		}

}

window.onload = function() {
	setInterval('changeBanner()', 3000);
}