Hep needed with Customized paging with extjs4

Dear all,

I understand I can use pageSize and other features to achieve paging. However, I want to be able to write my own paging logic at the server side where in I want to fetch only the records (5 at a time) that I want to display on the page.



When someone clicks on the next button, I want to pass the page size and the row index to the server.

How can I achieve that using extjs 4.



Any help would be highly appreciated.



Thanks,

Rajesh