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So you could do something like:
However, this is only for googlebot/yahoobot for the moment. MSN does not support wildcards (to my knowledge)..
It is always best to move all your images into a single directory and then do something like:
Hope this helps...
But perhaps because of this, now is a good opportunity to test this, for i don't think it'll take much longer till the next update...
Which probably holds many surprises for us... the site that has redirected all non-www's and since then found out that 60% of the pics were crawled as such :P