function checkText(obj) {
    var defText = 'zoekwoord invullen';

    if(obj.value == defText) {
        obj.value = '';
    }
    else if(obj.value == '') {
        obj.value = defText;
    }
}

function toggleOpdrachtgever(sourceObj, obj) {
    if(obj.style.display == '') {
        obj.style.display = 'none';
        sourceObj.className = '';
    }
    else {
        obj.style.display = '';
        sourceObj.className = 'active';
    }
}