positioning of div's

Usually we position division based upon the left and top coordinates of the object.

I was wondering if it is possible to position a division based upon it's center point.

If I have a div which contains pictures and i do not know in advance the size of the image (no scaling, please) how can i make the center fixed and let the object grow outwards...

Hope this description is clear enough to understand....

plz help, thnx

you should just be able to set the div to align:center, or text-align: center

Or you could put the whole div in a table and have it align to the center