title: Unable to get property 'replace' of undefined - only in IE9
body: <p>I only receive this error in Internet Explorer 9. IE7, IE8 and IE10 run the script fine. It is a banner of fading images, one after the other all stacked and fade in to each other.</p>
  
  <p>When you attempt to load the page on IE9, it throws an error. The error occurs within prototype.js and I get this error.</p>
  
  <blockquote>
    <p>SCRIPT5007: Unable to get property 'replace' of undefined or null reference 
    prototype.js, line 334 character 24</p>
  </blockquote>
  
  <p>Why would this happen in IE9 but not any earlier version??</p>