var rotateImages = new Array();
  rotateImages[0]="images/frontpage1.jpg";
  rotateImages[1]="images/frontpage2.jpg";
  rotateImages[2]="images/frontpage3.jpg";
  rotateImages[3]="images/frontpage4.jpg";

var whichImage = 0;
var numberImage = rotateImages.length;

function rotate() {
  whichImage++;
  if (whichImage == numberImage) {
    whichImage = 0;
  }
  document.rotate.src=rotateImages[whichImage];
  setTimeout("rotate()", 8*1000);
}
window.onload=rotate;