Jquery Corners produces a white background. I need transparent background corners

Question

Im creating a navigation window with tabs round cornered. im trying to do this but jquery corner produces a white background ar corners. How can we overcome that problem. here is the snapshow of my navigation bar

http://www.flickr.com/photos/41695354@N08/3858299131/

Answer 1

set the color with cc:

$("myDiv").corner("cc:#fff round 20px");

Answer 2

it doesnt work in IE, the background colour is always white