function get_random() {
  // Make sure that random()*X) has the correct number.
  var ranNum = Math.floor(Math.random() * 6);
  return ranNum;
}
var whichImg = get_random();
function show_image() {
  // Make sure that Array(X) has the number of images
  var img = new Array(5)
  img[0] = '../img/bg/Feb_home_1.jpg';
  img[1] = '../img/bg/Feb_home_3.jpg';
  img[2] = '../img/bg/Feb_home_5.jpg';
  img[3] = '../img/bg/Feb_home_6.jpg';
  img[4] = '../img/bg/Feb_home_7.jpg';
  img[5] = '../img/bg/Feb_home_8.jpg';
  // Here the actual displaying of the image is taking place.
  document.write("<div id='righttop' style='background:url(");
  document.write(img[whichImg]);
  document.write(") #ffffff no-repeat;'>");
}