function checkform ( form )
{
    // ** START **
    if (form.nadawca_nazwa.value == "") {
        alert( "Please fill up the Name." );
        form.nadawca_nazwa.focus();
        return false ;
    }
	 if (form.nadawca_email.value == "") {
        alert( "Please fill up your email." );
        form.nadawca_email.focus();
        return false ;
    }
	 if (form.temat.value == "") {
        alert( "Please fill up the subject." );
        form.temat.focus();
        return false ;
    }
	 if (form.tresc.value == "") {
        alert( "Please fill up the content." );
        form.tresc.focus();
        return false ;
    }
    // ** END **
	return true ;
}