[Centering a div vertically]

Thanks MacRankin for the info. Helpful, but I think I'm looking for something that doesn't exist.

[Centering a div vertically]

I would like to center a div vertically within a containing div without having to manually figure the height of the containing div, and then applying the appropriate top margin to the inner div.

 

I know you can't use margin: auto 0;.

 

So, what are my options? Can I do this with javascript?