how do i make a divbox have round corners and not just in firefox?
I would go with CSS3 approach with border-radius:
-moz-border-radius: 8px; -webkit-border-radius: 8px; border-radius: 8px;
That will hit many of the browsers, of course missing IE.
Along with the CSS3 you can also add the script here for older browsers - http://curvycorners.net/
This trusty solution is also pretty neat, and it can be done with PNG-images nowadays: http://www.alistapart.com/articles/mountaintop
To make them work across most modern browsers, use the CSS3 solution Thomas J Bradley put forward on the post above. dd_roundies seems like quite a nice solution to the IE problem.
why not use jQuery? http://malsup.com/jquery/corner/ I've used it successfully in IE6+. Very easy to configure.