function showInputVal(obj, txt) {
        if(obj.value=='') {
                obj.value=txt;
        }
}

function hideInputVal(obj, txt) {
        if(obj.value==txt) {
                obj.value='';
        }
}

function dontSend(formular, prehled) {
        for (polozka in prehled) {
            if (formular[polozka].value == prehled[polozka]) {
                formular[polozka].value = '';
            }
        }
}