var iValue, rNumber;

var img1 = new Image();
var img2 = new Image();
var img3 = new Image();
var img4 = new Image();
var img5 = new Image();
var img6 = new Image();
var img7 = new Image();
var img8 = new Image();
var img9 = new Image();
var img10 = new Image();
var img11 = new Image();
img1.src = "../../image/random/img01.jpg";
img2.src = "../../image/random/img02.jpg";
img3.src = "../../image/random/img03.jpg";
img4.src = "../../image/random/img04.jpg";
img5.src = "../../image/random/img05.jpg";
img6.src = "../../image/random/img06.jpg";
img7.src = "../../image/random/img07.jpg";
img8.src = "../../image/random/img08.jpg";
img9.src = "../../image/random/img09.jpg";
img10.src = "../../image/random/img10.jpg";
img10.src = "../../image/random/img11.jpg";

function displayImage(){
  iValue = Math.random() * 10;
  rNumber = Math.ceil(iValue);
  if(rNumber==0) rNumber++;
  document.image1.src=eval("img" + rNumber + ".src");
}