Fix Chrome background refresh bug

refreshBackgrounds.js

function refreshBackgrounds(selector) {
  // Chrome shim to fix http://groups.google.com/a/chromium.org/group/chromium-bugs/browse_thread/thread/1b6a86d6d4cb8b04/739e937fa945a921
  // Remove this once Chrome fixes its bug.
  if (/chrome/.test(navigator.userAgent.toLowerCase())) {
    $(selector).each(function() {
      var $this = $(this);
      if ($this.css("background-image")) {
        var oldBackgroundImage = $this.css("background-image");
        setTimeout(function() {
          $this.css("background-image", oldBackgroundImage);
        }, 1);
      }
    });
  }
}

// You'll need to call this every time the event occurs that exposes the bug, such as changing tab divs.
refreshBackgrounds(".something-with-a-background-image");
refreshBackgrounds("*"); // but it'll be slow!