function popimg(img, title, width, height) {
  width = width + 15;
  height = height + 15;
  if(navigator.appName == "Netscape") {
    window.open('img/' + img,title,"screenX=0,screenY=0,width=" + width + ",height=" + height + ",scrollbars=no,status=no,menubar=no,location=no,toolbar=no,resizable=no");
  } else {
    width = width + 8;
    height = height + 15;
    window.open('img/' + img,title,"width=" + width + ",height=" + height + ",scrollbars=no,status=no,menubar=no,location=no,toolbar=no,resizable=no,navigationbar=0");
  }
}