[photoshop-beginners] resizing images in bulk?

I need to get over 500 images on an online site for a client to view...they're full res now, it's taking For. Ev. Ver. Isn't there someway to resize them *all* down as a batch, just so I can get them on the site quickly for her to view and select?? 

I have Canon DPP, PS Cs4, and Paint Shop Pro v7.

Thanks.

Bettye

 

Bettye L. Rainwater Dragonfly Vintage Clothing http://stores.ebay.com/dragonflyvintageclothing - things for sale http://onceisawadragonfly.blogspot.com/ - life and thoughts http://www.flickr.com/photos/dragonflyvintage/ - photography http://pinterest.com/dragonflyvtg/ - i see things

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