With images. You have to cut up a square/rectangle with rounded corners in
image editing software to create rounded corners that you can place into a
table. It's tricky if you want to get it to expand width-wise as you would
need to carefully craft the border lines. Basically though, HTML doesn't
have a rounding for table cells itself so it must be done in graphics. Some
people use the <fieldset> tag to surround some text so it will appear in an
object with rounded corners, but the rounded corners are only in IE. In
other browsers such as Opera the fieldset area has squared corners.