PHP script to re-filter mysql results?

[anfy1]

Hi

Im using dwmx/mysql/php

Does anyone have a php code which shows as a text button on the page which
when clicked i can get to refilter my results?

i.e. my current page is selecting all records:

$query_computersrs = "SELECT * FROM computers ORDER BY `no` ASC";

i am trying to add buttons to that page which users can click to re-filter the
results i.e. to:

$query_computersrs = "SELECT * FROM computers WHERE monitors='yes' ORDER BY
`no` ASC";

Any help would be very much appreciated. I've been googling for a working
code for over 3 hours :/