function check_answers()
//{{{
// bool check_answers ()
// pouziti: test.php - potvrzeni odeslani + kontrola, jestli jsou odpovezeny
//   vsechny otazky
// jestlize uzivatel souhlasi s odeslanim a vyplnil vsechny otazky, vraci true,
//   jinak vraci false
{
    var missing = Array();
    var i;
    
    for (i=1; i<=20; i++)
    {
        if (document.getElementById('odpoved_'+i+'_a').checked == false &&
            document.getElementById('odpoved_'+i+'_b').checked == false &&
            document.getElementById('odpoved_'+i+'_c').checked == false)
        {
            missing.push(i);
        }
    }
    
    if (missing.length == 0)
    {
        return confirm("Skutečně chcete odeslat test?");
    }
    
    var cz = (missing.length == 1 ? "otázku" : "otázky");
    var missing_text = "Vyplňte prosím " + cz + " č. ";
    missing_text += missing.join(", ");
    
    alert(missing_text);
    
    return false;
}
//}}}
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