title: String.charCodeAt undefined?
body: <p>I get this error in the javascript debug panel when trying to call String.charCodeAt('9') in Safari 3.  </p>
  
  <blockquote>
    <p>TypeError: Result of expression 'String.charCodeAt' [undefined] is not a function.</p>
  </blockquote>
  
  <p>When I try to do stringInstance.charCodeAt('9') instead, I get NaN.  Am I doing something wrong?  I'd just like to get the char code for some characters to match against keypresses.  String.charCodeAt('9') returns 57 (as expected) on Firefox.</p>