PIE — this section uses PIE in IE for the corners.
Should work in all IE browsers, rounding the corners correctly, mostly.
Note that while the "darken" (left) hover effect is rounded, the opacity is lost.
Also, while the area is rounded, the hover effect is not on the "lighten" (right) image.
Mostly PIE — this section uses PIE in IE for the corners.
The "darken" item regains its opacity, but loses its rounded corners (on hover).
This is accomplished by not including the translucent "background" in the PIE directive in the JS.