.oO(mjs)

>Any way to tell the browser to display a vertical scrollbar on a div with
>overflow, but never an horizontal one?

overflow-y

It's CSS 3, so browser support is limited, but should be good enough
(test it). The most modern browsers like Opera and Firefox support it.
IE 6 and above should work as well, because IE already supported this
property as a proprietary extension before it became part of CSS 3.

Micha