DHTML = (document.getElementById || document.all || document.layers)

var DHTML;
var activeImage = 0;

//cross-browser getElementById function

function getObj(name) {
	if (document.getElementById) {
		this.obj = document.getElementById(name);
//alert(name);
		this.style = document.getElementById(name).style;
	} else if (document.all) {
		this.obj = document.all[name];
		this.style = document.all[name].style;
	} else if (document.layers) {
		this.obj = document.layers[name];
		this.style = document.layers[name];
	}
}
			
function rotateImage() {
		rotateActiveImage((activeImage + 1) % NUMBEROFIMAGES)
}
		
function rotateActiveImage (newImage) {
		if (!DHTML) return;
		for (i= 0; i < NUMBEROFIMAGES; i++) {

			var x = new getObj('image'+ i);

			if (i == newImage) {
						x.style.visibility = 'visible';
			} else {
						x.style.visibility = 'hidden';
			}
		}
			
		activeImage = newImage;
}
			
self.setInterval('rotateImage()',2500);