function CheckSubscribtionForm(){
    test_subscribtion_email=/^[0-9a-zA-Z._-]+\@[0-9a-zA-Z_-]+\.[0-9a-zA-Z.]+$/;
    if(test_subscribtion_email.test(document.form.subscribtion_email.value)==false){
        window.alert("Wpisz poprawny adres email.");
        document.form.subscribtion_email.focus();
        return false;
    }
}