Do you mean rounded corners for the tabs themselves? As this script pretty much lets you use any CSS menu for the tabs, this is more of a matter of just finding a CSS tab menu with the desired rounded corners look.
FYI in Mozilla and CSS3 supporting browsers, you can easily create rounded corners by using rules like:
Code:
-moz-border-radius-bottomleft: 5px;
border-bottom-left-radius: 5px;
-moz-border-radius-bottomright: 5px;
border-bottom-right-radius: 5px;
As seen here. Or, you can use an image based rounded corner interface, as seen here.
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