If you are a web developer then you probably know how much trouble it is to do a rounded corner using pure css + html tag only.

Sure you can use some of css techniques such as creating a small pseudo area on each corner and supply it with a corner image to simulate the rounded corner looks.

While its possible to do a rounded corner using pure css and one may debate that using jQuery to round your corner is not really browser compliant, Its really possible and usable in production site to utilize jQuery in rounding your element corner.

Drupal has a contrib module to utilize jQuery rounded corner plugin. It is very easy to install and configure.

You need to download the modules at http://drupal.org/project/rounded_corners, then extract it to sites/all/modules (or your equivalent path), enable the module, go to its configuration page and fill out the element id or class that you want to round its corner.

Voila! you got your self a rounded corner in less than 15 minutes.

Project Rounded corner
Url : http://drupal.org/project/rounded_corners