CSS to center an image and constrain long captions

[dacoyle]

We already have classes that left or right align images, automatically wrap long captions, and lets the text flow around the image/caption. We'd like something similar for centered images, but the left/right styles use position: absolute, so we need a new approach.

We can't use HTML5 yet. So, with XHTML 1 Transitional, is there a way to use CSS to center an image, constrain long captions to the width of the image without setting a width manually, and left align the text under the image?

Thanks!