//$j = jQuery;
function service_search() {
    var data = document.forms[0];
    var flg_alert1 = true;
    var flg_alert2 = true;
    var form_items = data.elements.length;
    var area_elements_num = 16;

    for(i = 0; i < form_items; i++) {
        if(data.elements[i].type == 'checkbox' && data.elements[i].checked == true) {
            if(i < area_elements_num) {
                flg_alert1 = false;
            } else {
                flg_alert2 = false;
            }
        }
    }
    if(flg_alert1 == true && flg_alert2 == true) {
        document.getElementById('alert1').style.display = 'block';
        document.getElementById('alert2').style.display = 'none';
        return false;
    } else if(flg_alert2 == true) {
        document.getElementById('alert2').style.display = 'block';
        document.getElementById('alert1').style.display = 'none';
        return false;
    } else {
        return true;
    }
}