function kategorie_check_text(checkbox_id) {

    var elems = document.getElementById('param_search').getElementsByTagName('input');
    for(i=0;i<elems.length;i++) {
        elem = elems[i];
        if(elem.name.match(/kategorie/i)) {
            elem.checked = false;
        }
    }
    var ch = document.getElementById(checkbox_id);
    ch.checked=true;
    document.getElementById('param_search').submit();
    return false;
}