function ValidateData() {
    var ctrlUserMail = document.getElementById('idEmail');
    var ctrlUserMailConf = document.getElementById('idEmailConf');
    var ctrlName = document.getElementById('idName');
    var ctrlSubject = document.getElementById('idSubject');
    var ctrlBody = document.getElementById('idBody');

    if (ctrlName.value == "") {
        ctrlName.select();
        alert("Enter your name.   ");
        return false;
    }
    
    if (!IsSmtpAddress(ctrlUserMail.value)) {
        ctrlUserMail.select();
        alert("Enter the correct e-mail address.   ");
        return false;
    }
    
    if (ctrlUserMail.value != ctrlUserMailConf.value) {
        ctrlUserMailConf.select();
        alert("Enter the correct e-mail address.   ");
        return false;
    }

    if ( ctrlSubject.value == "") {
        ctrlSubject.focus();
        alert("Choose subject.   ");
        return false;
    }
    

    if ( ctrlBody.value == "" ){
        ctrlBody.select();
        alert("Enter a text of the message.   ");
        return false;
    }

    var ctrlCode = document.getElementById('id_code');
    if (trim(ctrlCode.value) != '4567') {
        ctrlCode.value = '';
        ctrlCode.select();
        alert("Please enter antispam number 4567 into the form field.   ");
        return false;
    }
}