pix = new Array("n0","n1","n2","n3","n4","n5","n6","n7");

var i = 0;

function slideshow(){
setInterval("change()", 8000);
}

function change(){
for (var count = 0; count <= 7; count++) {
			     document.getElementById("n"+count).style.display = 'none';
			     }
			     i = i + 1;
			     if (i > (pix.length - 1)) {i = 0}
	document.getElementById(pix[i]).style.display = 'block';
	}