// JavaScript Document
function randomimg(){
  var img=new Array()
  //specify random images below. You can have as many as you wish
  img[1]="images/foto-104.gif"
  img[2]="images/foto-105.gif"
  img[3]="images/foto-106.gif"
  img[4]="images/foto-107.gif"

  var nr=Math.floor(Math.random()*img.length)

  if (nr==0)
     nr=1
     document.write('<img src="'+img[nr]+'"')
}

randomimg();