Ajax / CSS - Ajax Anywhere

AjaxAnywhere is designed to turn any set of existing JSP components into AJAX-aware components without complex JavaScript coding.
In contrast to other solutions, AjaxAnywhere is not component-oriented. You will not find here yet another AutoComplete component.
Simply separate your web page into multiple zones, and use AjaxAnywhere to refresh only those zones that needs to be updated.

# Less JavaScript to develop and to maintain. Absence of commonly accepted naming convention, formatting rules, patterns makes JavaScript code messier then Java/JSP. It is extremely difficult to debug and unit-test it in multi-browser environment. Get rid of all those complexities by using AjaxAnywhere.
# Easy to integrate. AjaxAnywhere does not require changing the underlying application code.
# Lower technical risk. Switch whenever you need between AJAX and traditional (refresh-all-page) behaviour of your web application. Your application can also support both behaviors.
# Free open source license.

http://ajaxanywhere.sourceforge.net/