I am writing here that how you can resize those 1000 images within a minute as I have written articles on "how to approve a web design layout quickly" and "5 steps of quick and perfect website layout design" to get quick solution.
Please follow steps below:
Choose File and click on Show All Menu Items.
Choose File > Scripts > Image Processor.
You will get a popup window > Click select folder > Choose folder where the series of images stored.
Choose another folder/location to save processed images. Then put the image size in resize to Fit box. Now it's ready for run.
Click on Run button and the images will be automatically opened, resized, saved and closed. To see your resized images, choose File > Open and navigate to the folder that you specified the images to be saved to.