partial Page refresh

Skills: PHP and Microsoft SQl Server I have a web page that contains 1. menu Items 2. Search Part 3. Grid When user request this page, it should first load menu and then search and finally grid. All these steps need Ajax JQuery. When user perform search, right now it loads the complete page. It should only refresh grid using Ajax. JQuery. There is one button in grid that also further filters grid using full page refresh. So this should also refresh only grid not full page I want ajax loader images while the loading is in progress.