// choose_css.js
  // -------------
  // choose the appropriate stylesheet according to
  // the user's screen resolution

  document.write("<link rel='stylesheet' type='text/css' href='");

  if (window.screen.height <= 1200 || window.screen.width <= 800) {
    //resolution is 1200x800 or less
    document.write("stylesmall.css'>");
  } else {
    document.write("bigstyle.css'>");
  }