SUFFIX_DAY = 'Day';
SUFFIX_MONTH = 'Month';
SUFFIX_YEAR = 'Year';
DATE_DELIMITER = '-';

function gotoFirstControl(aform)
{
    for (var i = 0; i < aform.elements.length; i++)
    {
        obj = aform.elements[i];
        if (obj.type != 'hidden') {
            obj.focus();
            break;
        }
    }
}

function gotoControl(aform, control)
{
    // control maybe its name or its order in the form
    obj = aform.elements[control];
    if ((typeof(obj) != 'undefined') && (obj.type != 'hidden'))
        obj.focus();
}


function setDateValue(aform, date_name, val)
{
    date_array = val.split(DATE_DELIMITER, 3);
    setControlValue(aform.elements[date_name + SUFFIX_YEAR], date_array[0]);
    setControlValue(aform.elements[date_name + SUFFIX_MONTH], date_array[1]);
    setControlValue(aform.elements[date_name + SUFFIX_DAY], date_array[2]);
}

function autochangeDateSelect(aform, source, target, offset)
{
    checkin = getDateStringFromSelect(aform, source);
    setDateValue(aform, target, relativeDate(checkin, offset));
}

function setControlValueByName(aform, name, val)
{
    obj = aform.elements[name];
    setControlValue(obj, val);
}

function setControlValue(obj, val)
{
    if (obj == null) return false;
    if (typeof(obj.type) == 'undefined')
        if (obj.length > 0)
            objtype = obj[0].type;
        else
            objtype = 'unknown';
    else
        if (obj.type == 'radio')
            objtype = 'checkbox';
        else
            objtype = obj.type;
    switch (objtype) {
        case 'select-one':
            for (var i = 0; i < obj.options.length; i++) {
                if (obj.options[i].value == val) {
                    obj.selectedIndex = i;
                    break;
                }
            }
            break;
        case 'checkbox':
            if (obj.value == val)
                obj.checked = true;
            else
                obj.checked = false;
            break;
        case 'radio':
            for (var i = 0; i < obj.length; i++) {
                if (obj[i].value == val) {
                    obj[i].checked = true;
                    break;
                }
            }
            break;
        default:
            obj.value = val;
    }
    return true;
}

function onClickRadioCheckboxValue(obj)		// can merge with setControlValue
{
    if ((obj == null) || (obj.form == null))
        return false;
    if (!obj.checked)
        return true;							// nothing to change
    arrCb = obj.form.elements[obj.name];
    if ((typeof(arrCb.type) != 'undefined') && (arrCb.length <= 0))
        return false;		// not array of checkbox
    for (var i = 0; i < arrCb.length; i++)
        if (arrCb[i].value != obj.value)
            arrCb[i].checked = false;
    return true;
}