AJAX and PHP

HI, i'm currently working on some web application and i would like to know what is the best way to do what i want. basically like all application i have a menu and based on selected item menu i want to display a page (basically 50 % of this new page is DB result/grid. As usual i have 2 divs, one for the menu one for the content of DB to display. i would like to know if it's not better to use AJAX to load the content of the second div (DB result and other stuff) instead to every time load a new page which load menu and content of DB ? what are your experiences on such thing ? thx. -- Alain ------------------------------------ Windows XP SP3 PostgreSQL 8.2.4 / MS SQL server 2005 Apache 2.2.4 PHP 5.2.4 C# 2005-2008