Auto selection of portrait or Landscap image

Hi,
Here is the page in question.
http://www.theremotedoctor.co.uk/victorias_attic.html

Currently photos are being uploaded as Portrait 956 x 1280 & are then resized on the page to 764 x 1024
I would now also like to use the Landscape option where photos would be uploaded as 1280 x 956 & then resized on the page to 1024 x 764
My question is,will it be possible to edit the original code or add to it so when i enter the link in my link box in dream weaver the system will recognise the photo as Landscape or Portrait without me having to have 2 different size areas for the photo.

If you understand what i mean.