File>Scripts>Image Processor will allow this.
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First select the folder or images you want to edit. Then select the location you want them saved to. For example they will be saved in a folder called JPG (if you save as jpg format).
When you select the JPG format, firstly select the amount of compression. Depending on my use and file size I require I vary this.
Next (and importantly for you) is the point where you set the maximum size (in pixels) that the image can be.
If you need images that are 800 pixels high, set the height to 800 and leave the width blank.
This will set all your images to 800 pixels high and the width will be the default (whatever that may be). I usually set the maximum Width/Height to be the same size for consistency - the above will convert all my images to a maximum height of 700 pixels (for portrait images) and 700 pixels wide (for landscape style images)
Hope this has helped those using CS3 although this works in previous versions too..... Lightroom also has this capability.
Regards JD