function random_image(num1,num2) {
if((num1 - num2) > 0) {
var big = num1
var small = num2
} else {
var big = num2
var small = num1
}
var range = big - small + 1
var number = Math.floor(Math.random()*range) + small
return(number)
}
function random_img() {
var img_src = "./files/topimg0" + random_image(1,5) + ".jpg"
document.write("<IMG SRC='" + img_src + "' width=800px height=494px>")
}


var img = new Image();
img.src = "./img/arrowred.jpg";
img.src = "./img/arrow.jpg";
 
function pic(id, image) {
  document.images[id].src = image;
  document.images[id].alt = image;
}