function random_imglink(){
 var myimages=new Array()
  myimages[1]="http://ear.industriales.org/images/list/galeria-60cb1e6df4af98b971e8dfd7f0df33f4-galHome.jpg"
  myimages[2]="http://ear.industriales.org/images/list/galeria-02ec1db66671168e63aaf9ae3d97ca47-.jpg"
  myimages[3]="http://ear.industriales.org/images/list/galeria-bc7bf9c445fab6c75e8eee28f2019084-galHome.jpg"
  myimages[4]="http://ear.industriales.org/images/list/galeria-fd2025083d7046394d6af79c4d1d58c1-galHome.jpg"
  var ry=Math.floor(Math.random()*myimages.length)
  if (ry==0)
     ry=1
     document.write('<td style="background: url('+myimages[ry]+') right no-repeat;">');
}