There should be something in the batch commands for that. Or you should be able to do it once, while recording the action, then replay over the rest.
Photoshop CS3.
Scripts menu - Image Processor
you can create an action that will save for web and/or resize to whatever you want. But it'll use the same compression settings for every image and you might not want that depending on what the images are.
Subtlety is my middle name... and first and last in case you didn't get the point.
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