best pagination process

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Javascript

PHP

Hi guys... I'm trying to design a page that has a pagination and a table to display the result. and on the header of the table i have a textfield where user can input a filter value and the result will be filtered base on the value you inputted on the textfield. Now i saw this one website where they have this kind of function and i noticed that after typing the value in the filter field and clicking the submit button it will automatically filter the result and display on the table.
Well i know how to do that but the thing is when i try to refresh their page the result still remain it means the filtering was retained... i was expecting it will go back to the default display result.. but how is it possible that they were able to retain the search result even after refreshing the page?
- I was thinking it was save on a session. but it was not since i created a script that will destroy all session on the browser...
- the second guess would be their using $_GET['method'] but the url does not change even your doing filtering
- and its not a POST method since the Post method will only work on submit but not on refresh page...
- its not on the cookie since i clear all my browser cookie

any idea how do they accomplish this kind of trick?