function CheckForm(){
    var Form = document.Form;
    var error = 0;
    var error_message = "You must fill all required field:\n\n";
    
    if (Form.first_name.value == "") {
        error_message += "* First Name\n";
        error = 1;
    }
    if (Form.last_name.value == "") {
        error_message += "* Last Name\n";
        error = 1;
    }
    if (Form.email.value == "") {
        error_message += "* Email\n";
        error = 1;
    }
    if (Form.telephone.value == "") {
        error_message += "* Telephone\n";
        error = 1;
    }
    if (Form.arrivial_date.value == "") {
        error_message += "* Arrival Date\n";
        error = 1;
    }
    if (Form.departure_date.value == "") {
        error_message += "* Departure Date\n";
        error = 1;
    }
    if (Form.cc_owner.value == "") {
        error_message += "* Credit Card Owner\n";
        error = 1;
    }
    if (Form.cc_number.value == "") {
        error_message += "* Credit Card Number\n";
        error = 1;
    }
    
    data = new Date();
    rok = data.getYear();
    miesiac = data.getMonth();
    rok_cc = "20" + Form.cc_expires_year.value;
    miesiac_cc = Form.cc_expires_month.value;
    
    //alert(miesiac_cc+miesiac);
    if (parseInt(rok_cc) < parseInt(rok) || (parseInt(rok_cc) == parseInt(rok) && parseInt(miesiac_cc) < parseInt(miesiac))) {
    
        error_message += "* Wrong Credit Card Expiry Date\n";
        error = 1;
    }
    
    if (error == 1) {
        alert(error_message);
        return false;
    }
    else {
        return true;
    }
}