title: JavaScript: Overriding alert()
body: <p>Has anyone got any experience with overriding the <code>alert()</code> function in JavaScript?</p>
  
  <ul>
  <li>Which browsers support this?</li>
  <li>Which browser-versions support this?</li>
  <li>What are the dangers in overriding the function?</li>
  </ul>