I've looked at countless articles regarding fixed/stretching sidebars, but none that answers my question, and I've tried even more ways that I can think of, but none give me exactly what I'm looking for.
I want a left sidebar (fixed-width, %s, ems, units don't matter here) that stretches out the whole way to the bottom of the page (where, incidentally, there's going to be a footer).
Ideally, part of the sidebar (namely, the links) would have a position:fixed, but if it's not possible, then without it.
What I get into problems doing is getting the content, when under, say, 400px, to go below the sidebar. I've tried everything: images, background images, paddings, negative margins, and nothing seems to make it work just right.