Rounded Corners in IE 7+ with/without javascript?

To create rounded corners on my container elements I use this css...

border-radius:12px; -moz-border-radius: 12px; -webkit-border-radius: 12px;

However, IE does not appear to recognize and interpret the border-radius property (at least version 7-8, apparently its slated for version 9).

Is there a workaround for this that's doable entirely in css (no script, no extra markup)?

For Javascript/jQuery solutions: I'd use a solution based on these if I could include a single script that would read my css, interpret the border-radius properties (including border-top-left-radius, border-top-right-radius), and apply the corners accordingly. Does this exist?