var c = 1;

/* Preloading images */
var image1 = new Image();
image1.src = "bilder/slide1.jpg";
var image2 = new Image();
image2.src = "bilder/slide2.jpg";
var image3 = new Image();
image3.src = "bilder/slide3.jpg";
var image4 = new Image();
image4.src = "bilder/slide4.jpg";
var image5 = new Image();
image5.src = "bilder/slide5.jpg";

function disp_img(w)
   {
   if (c == 6)
      {
      c = 1;
      }
   var img_src = "bilder/slide" + c + ".jpg";
   document.slides.src = img_src;
   c++;
   }
t = setInterval("disp_img(c)", 3000);