Try:
$search_rsProductListing->setSearch(array("type"=>"Checkbox", "comparison"=>"=", "join"=>"AND"), array("pkBrand"), "i", (isset($_GET["brands"]?"1":"0"));
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.