$qs = explode('&',$_SERVER['QUERY_STRING']);
$prodid = explode('=',$qs[0]);
$prod_ID = $prodid[count($prodid)-1];

$catid = explode('=',$qs[1]);
$lastnmbr = explode('_',$catid[1]);
$cat_ID = $lastnmbr[count($lastnmbr)-1];

$catid = explode('=',$qs[1]);

$prodid = explode('=',$qs[0]);

$catchk = explode($qs[0], '=');