function preloadImages() {
  var pic1= new Image(); 
  pic1.src="/images/sce/wwbgeeb.jpg";
  var pic2= new Image(); 
  pic2.src="/images/sce/wwbgdayconst.jpg";
  var pic3= new Image(); 
  pic3.src="/images/sce/wwbgsunset.jpg";
  var pic4= new Image(); 
  pic4.src="/images/sce/wwbgeve.jpg";

}