slideshowImage = new Array (

  "slideshow/Flu_White.jpg",
  "slideshow/ATP_thumb.jpg",
  "slideshow/blood cells.jpg",
  "slideshow/inside_DNA_thumb.jpg",
  "slideshow/swine_flu_thumb.jpg",
  "slideshow/genetic_testing_thumb.jpg",
  "slideshow/Glucose_Mod_thumb.jpg",
  "slideshow/DNA_2_thumb.jpg",
  "slideshow/common_cold_thumb.jpg", 
  "slideshow/RNASEA_thumb.jpg",
  "slideshow/caffeine_thumb.jpg"
);

var ImgNum = 0;
var ImgLength = slideshowImage.length - 1;
var delay = 2000;   //Time delay between Slides in milliseconds
var run;
run = setInterval("chgImg()", delay);

function chgImg() {
 if (document.images) {
  ImgNum = ImgNum + 1;

  if (ImgNum > ImgLength) {
      ImgNum = 0;
  }
  document.getElementById('Screen').src = slideshowImage[ImgNum];
 }
}