title: window.toString.call is undefined in IE8
body: <p>When you run:</p>
  
  <pre><code>window.toString.call("")
  </code></pre>
  
  <p>everything's fine in FF/CH but in IE8 you get a script error. Investigating a bit more it turned out, that <code>window.toString.call</code> is undefined in IE8?</p>
  
  <p>You can also run this one:</p>
  
  <pre><code>window.toString instanceof Function;
  // false
  
  alert(window.toString);
  // function toString() {
  //    [native code]
  // }
  </code></pre>
  
  <p><strong>Why is that and how to solve it?</strong> And I started wondering how come jQuery works in the first place?</p>