function registracetrida() {
    document.registrace_trida.action = 'registrace-trida-validace.php';
    return true;
}

function editacetrida() {
    document.editace_trida.action = 'detail-tridy-validace.php';
    return true;
}

function registracezak() {
    document.registrace_zak.action = 'registrace-zak-validace.php';
    return true;
}

function soutez_jidelnicek(typ) {
    if (typ=='aktivni') {
        soutez_jidelnicek_chod_porce_enable();
    }
    document.soutezjidelnicek.action = 'soutez-jidelnicek-save.php';
    return true;
}

function soutez_jidelnicek_uzavri_den() {
    soutez_jidelnicek_chod_porce_enable();

   	obj = document.getElementById('den_uzavren');

    obj.value = '1';
    document.soutezjidelnicek.action = 'soutez-jidelnicek-save.php';
    return true;
}

function soutez_jidelnicek_uzavri_lekci() {
    document.soutezjidelnicek.action = 'soutez-uzavrit-lekci.php';
    return true;
}

function soutez_jidelnicek_potravina_plus(field_name) {
    var obj;
    var krok = 0.5;
    var max  = 10;

   	obj = document.getElementById(field_name);

    if (obj.value==max) {
        return;
    }
    if (parseFloat (obj.value) > 0) {
        obj.value = parseFloat (obj.value) + krok;
    }
    else {
        obj.value = krok;
    }

    return true;
}

function soutez_jidelnicek_potravina_minus(field_name) {
    var obj;
    var krok = 0.5;

   	obj = document.getElementById(field_name);

    if (parseFloat (obj.value) > 0) {
        obj.value = parseFloat (obj.value) - krok;
        if (parseFloat (obj.value)==0) {
            obj.value = '';
        }
    }
    else {
        obj.value = '';
    }

    return true;
}

function soutez_jidelnicek_chod_porce_enable() {
    var obj;
    var pocet_chodu;
    var global_jidelnicek_chod_potraviny_select_pocet;

    pocet_chodu = 6;
    global_jidelnicek_chod_potraviny_select_pocet = 9;

    for (i = 1; i <= pocet_chodu; i++) {
        for (j = 1; j <= global_jidelnicek_chod_potraviny_select_pocet; j++) {
           	obj = document.getElementById('chod_porce'+String(i)+String(j));
            obj.disabled = false;
        }
    }

    return true;
}


function napoveda_show(idj) {
   napoveda_hide();
   document.getElementById(idj).style.display = 'block';
}

function napoveda_hide() {
   var idj1;
   var idj2;
   var jidel1;
   var jidel2;
   var jidel3;

   jidel1 = 9;

   for ( i = 1; i <= jidel1; i++) {
      idj1 = 'jidlo00'+i;
      if (document.getElementById(idj1))
         document.getElementById(idj1).style.display = 'none';
   }


   jidel2 = 10;
   jidel3 = jidel2*2;

   for ( i = 10; i <= jidel3; i++) {
      idj2 = 'jidlo0'+i;
      if (document.getElementById(idj2))
         document.getElementById(idj2).style.display = 'none';
   }
}