if (navigator.userAgent.indexOf('MSIE') != -1) {

  document.write('<div id="ie-notice" style="color: black; border: 1px solid; background-color: #fdd; width: 700px; margin-left: auto; margin-right: auto; text-align: center; margin-bottom: 20px;"><p>You seem to be using Microsoft Internet Explorer. Although this site is made up of valid HTML 4.01 and CSS2, when using Internet Explorer, the layout will be messed up, because Microsoft deliberately sabotages the CSS standard (among other things). I have no intention of including all sorts of work arounds for this. Do yourself a favor, get <a href="http://www.mozilla.com/firefox/">Firefox</a>. It is more secure and much more convenient. Any other normal browser will do as well...</p></div>');

}