[gears-users] Manifest mapping

[meerkat]

// URLs to be cached (URLs are given relative to the manifest URL)
  "entries": [
      { "url": "main.html", "src": "main_offline.html" },
      { "url": ".", "redirect": "main.html" },
      { "url": "main.js" }
      { "url": "formHandler.html", "ignoreQuery": true },
    ]

Hello,

In the above snippet from the Gears website how to you actually map
the user from an online page to the offline equivalent? I have a PDA
user who is logged  in online, does a sync then goes offline. How does
"main_offline.html" url get the user from online to offline?

thanks,
meerkat