function ClearKeyword(el) {
    if(el.value == 'Zoeken') el.value='';
}

function CheckKeyword(el) {
    if(el.value.length == 0) {
        alert("Er moet minimaal 1 veld ingevuld/gekozen worden.");
        return false;
    } else {
        document.searchformsite.submit();
    }
}