function refreshIt() {
   if (!document.images) return;
  if(document.getElementById('myCam')){
    document.images['myCam'].src = 'http://webcam.abaco-digital.es/pilar/image.jpg?' + Math.random();}  
if(document.getElementById('myCam2')){
    document.images['myCam2'].src = 'http://webcam.abaco-digital.es/zuda/image.jpg?' + Math.random();}
  if(document.getElementById('myCam3')){
    document.images['myCam3'].src = 'http://webcam.abaco-digital.es/pilar/image2.jpg?' + Math.random();}
if(document.getElementById('myCam4')){
    document.images['myCam4'].src = 'http://webcam.abaco-digital.es/zuda/image2.jpg?' + Math.random();}
setTimeout('refreshIt()',1000);
}
window.onload = setTimeout('refreshIt()',1000);