// JUST POST TO THE RIGHT URL (form action)
function doQuickSearch($webroot) {
    // get all search criteria
    $criteria = new Object();
    // get region
    if ($F('frm_qsearch_region') != '') {
        $criteria['1_region'] = $F('frm_qsearch_region');
    }
    // get direction
    if ($F('frm_qsearch_direction') != '') {
        $criteria['2_direction'] = $F('frm_qsearch_direction');
    }
    // get education
    if ($F('frm_qsearch_education') != '') {
        $criteria['3_education'] = $F('frm_qsearch_education');
    }
    // get level
    if ($F('frm_qsearch_level') != '') {
        $criteria['4_level'] = $F('frm_qsearch_level');
    }
    // get type (becomes pageUrl and behaves differently if no other criteria are selected)
    $pageUrl = 'zoekresultaten'; // default url
    if ($F('frm_qsearch_type') != '') {
        // if no other parameters are selected, get the plural name
        $pageUrl = $F('frm_qsearch_type');
        if (Object.values($criteria) == '') {
            $pageUrl = $('frm_qsearch_type').options[$('frm_qsearch_type').selectedIndex].readAttribute('plural');
        }
    }
    // form url
    $url = $webroot + $pageUrl;
    // paste all criteria to it
    for ($criterium in $criteria) {
        $url += '/' + $criteria[$criterium];
    }
    $('frm_qsearch').action = $url;
    return true;
}