How to theme a select box with multiple selection enabled I have a select box with multiple selection option enabled in my custom form. Everything is works fine, however the problem is the appearance is not good and also If I have more options then the selection becomes difficult.

Is there any module out there which offers left-right selection widget like below


or any other better solution which offers better user friendly selection for select box with multiple selection option enabled.

Hope there is an easy way to achieve this rather than writing custom CSS, jQuery/JavaScript code.
The Improved Multi Select widget sounds right up your street:

The Improved Multi Select module replace the default multi-select boxes with two pannel list and search.
The first panel holds the options that are available, and the second panel holds the options that have been selected.

It looks pretty good too: