function getEl(id) { return document.getElementById(id); }

function checkRecipient(field, maximal) {
    if (maximal == null) {
        maximal = 1;
    }
    var cat_field = getEl("cat_field");
    var party_field = getEl("party_field");
    var person_field = getEl("person_field");
    if (field == 'cat_field') {
        deselectAll(party_field);
        deselectAll(person_field);
        return verifyNumber(cat_field, maximal);
    } else if (field == 'party_field') {
        deselectAll(cat_field);
        deselectAll(person_field);
        return verifyNumber(party_field, maximal);
    } else if (field == 'person_field') {
        deselectAll(cat_field);
        deselectAll(party_field);
        return verifyNumber(person_field, maximal);
    }
}

function resetDD(element) {
    try {element.options[0].selected = true;}
    catch (e) { }
}

function deselectAll(field) {
    var element = getEl(field);
    for (i = 0; i < element.options.length; i++) {
        element.options[i].selected = false;
    }
}

function verifyNumber(element, count) {
    var checkCount = 0;
    
    for (i = 0; i < element.options.length; i++) {
        if (element.options[i].selected) {
            checkCount++;
        }
        if (checkCount > count)
            element.options[i].selected = false;
    }
    if (checkCount > count) {
        alert("Du har redan valt maximalt antal (" + count + ") mottagare.");
        return false;
    } else {
        return true;
    }
}