I need to batch process about 300 very large jpegs to smaller jpegs--how?

I have about 300 jpegs generated from Lightroom.  They are about 30 MB apiece.  I need to make them much smaller, for a DVD and for quick viewing for my client.  I tried using "file" from the top Photoshop menu bar, to "scripts" to "image processor," which I usually use  (but usually converting from dng to jpegs).  This time, no matter what sizes I entered in the ensuing window, the final jpeg size was 32KB.  This is too small!

How do I do this without overwriting the original photos, and getting useful final jpeg sizes?

Thanks,

Hillary