function randomCharImage() {
  var myimages = new Array(3)

  //specify random images below. You can have as many as you wish
  myimages[0]="image/hideo.jpg"
  myimages[1]="image/satoshi.jpg"
  myimages[2]="image/reina.jpg"

  var ry= Math.floor(Math.random() * (myimages.length));

  document.write('<img id="main_image" src="'+myimages[ry]+'" alt="" width="650" height="800">')
}