function openWindow(url,width,height) {
  w = window.open(url, 'image', " width=" + width + ",height=" + height +
  			     ",location=no,menubar=no,resizable=no,scrollbars=no,status=no");
  w.focus
}

function openImgWindow(url) {
    i = new Image();
    i.src = url;
  if (i.loaded) {
    openWindow(url, i.width*1.1, i.height*1.1);
  } else {
    openWindow(url, 800, 600);
  }
}