Mobile versions of CCK images (via Imagecache)

I have a new site that I  expect to be regularly accessed from mobile devices. Using Mobile Tools, I’m able to switch themes when a mobile device is detected, which works great.  But this site is heavy with images, attached to nodes via CCK imagefield and sized with Imagecache.  Ideally, on node view, I would be able to select different Imagecache profiles for my mobile vs desktop theme, but I just can’t figure out how to do that.

Here are the two basic strategies I thought of, but got nowhere with:

- In CCK Display settings for the node, if only there were a “Mobile” option along with “Basic”, “RSS”, “Search” and “Token”… Or can I use Token somehow? I don’t know how to make use of this option
- In Panels, I could create different variants of the node view for mobile vs primary theme, but how do I set “current theme” as the context (or otherwise know that the page is being viewed on a mobile device)?

I’d appreciate any thoughts on how I could accomplish this!

Because all your output is eventually controlled by your theme, you
could handle this with an override of theme_imagecache() in your
mobile theme.  Here’s how I’d do it:

1) create mobile versions of each imagecache preset you’d like
replaced (example: thumb and mobile_thumb, full and mobile_full)
2) create a mobiletheme_imacecache function, which works exactly the
same as theme_imagecache, but before just using the preset specified,
it first checks to see if there is a preset with the prefix “mobile_”
and if there is, it uses that instead.

There may be a more elegant solution, but I think this will do the
trick for you.