Takes long, but it works.

-Create a folder called "RESIZED" on your desktop
-Open a picture file in Photoshop
-Create a new action, and give it a Function key if you want. We'll call it "RESIZE"
-Start recording
-Image resize
-Resize to whatever you want, and hit OK
-File - Save as for Web
-Save the file in the RESIZED folder you created on the desktop
-DO NOT CHANGE THE FILE NAMES
-Save
-Then close your image- Do not save changes
-Stop recording.
Now you can resize the pic and save the edited size in the RESIZED folder by hitting whatever function key you gave it. And the original goes unedited.
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To resize a bunch at a time:

-Open Photoshop
-File - Automate - Batch
-Under PLAY - ACTION, choose the action RESIZE
-Source FOLDER, hit choose and pick the folder with all the pics you want to resize
-OK

That will open each picture up and run the action.