Trying to center an image

I'm using this as a photo gallery:

http://www.javascriptkit.com/script/script2/fadeincontentviewer.shtml

However, some of my images are different sizes, how do I center the image?
I've tried everything to no avail. I can't believe such a nice script doesn't center an image.

Thanks

If you just give a style of text-align:center; to the container of the image, it'll align centrally, since the img tag is an inline one by default.

Now post your current code or a link to your page, to get more help.