function patikrinti()
{
    if (document.submit_form['f_data[inputo_Vardas]'].value == '')
    {
        alert("Fill NAME, SURNAME!");
        return false;
    }
    if (document.submit_form['f_data[email]'].value == '')
    {
        alert("Fill E-MAIL!");
        return false;
    }
    if (document.submit_form['f_data[city]'].value == '')
    {
        alert("Fill CITY!");
        return false;
    }
    if (document.submit_form['f_data[text]'].value == '')
    {
        alert("Fill TEXT!");
        return false;
    }
    document.submit_form.submit();
}