title: How do I access the popup page DOM from bg page in Chrome extension?
body: <p>In Google Chrome's <a href="http://code.google.com/chrome/extensions/overview.html" rel="noreferrer">extension developer section</a>, it says</p>
  <blockquote>
  <p>The HTML pages inside an extension
  have complete access to each other's
  DOMs, and they can invoke functions on
  each other. ... The popup's contents
  are a web page defined by an HTML file
  (popup.html). The popup doesn't need
  to duplicate code that's in the
  background page (background.html)
  because the popup can invoke functions
  on the background page</p>
  </blockquote>
  <p>I've loaded and tested jQuery, and can access DOM elements in background.html with jQuery, but I cannot figure out how to get access to DOM elements in popup.html from background.html.</p>