function PopImage(img){
  foto1= new Image();
  foto1.src=(img);
  Control(img);
}
function Control(img){
  if((foto1.width!=0)&&(foto1.height!=0)){
    viewFoto(img);
  }
  else{
    fct="Control('"+img+"')";
    interval=setTimeout(fct,500);
  }
}

function viewFoto(img){
  wd=foto1.width+20;
  ht=foto1.height+20;
  size="width="+wd+",height="+ht;
  pop=window.open(img,"",size);
}