var imglist = new Array(
      "img/enter/01.jpg",
      "img/enter/02.jpg",
      "img/enter/03.jpg",
      "img/enter/04.jpg",
      "img/enter/05.jpg",
      "img/enter/06.jpg",
      "img/enter/07.jpg",
      "img/enter/08.jpg",
      "img/enter/09.jpg",
      "img/enter/10.jpg",
      "img/enter/11.jpg",
      "img/enter/12.jpg",
      "img/enter/13.jpg",
      "img/enter/14.jpg",
      "img/enter/15.jpg",
      "img/enter/16.jpg",
      "img/enter/17.jpg",
      "img/enter/18.jpg" );
   var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
   var output = "<img src=" + imglist[selectnum] + " alt=\"DOES\" border=\"0\">";
   document.write(output);