getting a css box to fit to size of image in it

[cidic]

i'm workin on a css/php gallery with 2 boxes, one to hold categories and one to hold the full sized image. I need the box in the middle to re size itself to fit the image in it because the full size images can vary in size. when a thumbnail is clicked a variable is passed through to url to tell the middle content box to load the appropriate image, i need the box to then resize itself to fit the image. how can i do this?

site:

[KDLA]

You might investigate some javascripting that adjusts these heights for you. Unless you use something like width or height "auto," CSS probably won't be able to handle this alone.