// JavaScript Document
function CheckFrmOdberNovinek () {
  var formular = document.FrmOdberNovinek;
  var chyba = '';
  if(formular.email.value == '') {
    chyba += 'Zadejte Váš e-mail!\n';
  } else { 
    if(formular.email.value.indexOf("@") == -1 || formular.email.value.indexOf(".") == -1) {
      chyba += 'Formát e-mailové adresy je neplatný!\n';
    }
  }

  if (chyba != '') {
    window.alert (chyba);
    return false;
  }    
}

function ZmenObrazek (obr,ram) {
  var dalsirok = new Date ();
  dalsirok.setFullYear(dalsirok.getFullYear() + 1);
  
  if (document.getElementById(ram).style.display != 'none') {
    document.getElementById(obr).src = './images/down.png';
    document.getElementById(obr).title = 'zobrazit';
    document.getElementById(ram).style.display = 'none';
    document.cookie = ram + '=' + 'invisible; expires=' + dalsirok.toGMTString();
  } else {
    document.getElementById(obr).src = './images/up.png';
    document.getElementById(obr).title = 'skrýt';
    document.getElementById(ram).style.display = 'block';  
    document.cookie = ram + '=' + 'visible; expires=' + dalsirok.toGMTString();  
  }
  
  return false;
}


function StavRamu (obr,ram,stav) {
  switch (stav) {
    case 'invisible' :
      document.getElementById(obr).src = './images/down.png';
      document.getElementById(obr).title = 'zobrazit';
      document.getElementById(ram).style.display = 'none';    
      break;
    default :
    case 'visible' :
      document.getElementById(obr).src = './images/up.png';
      document.getElementById(obr).title = 'skrýt';    
      document.getElementById(ram).style.display = 'block';
      break;
  }
}

function show (elementID,odkaz,obrazek) {
  if (document.getElementById(elementID).style.display == 'none' || document.getElementById(elementID).style.display == '') {
    document.getElementById(elementID).style.display = 'inline';
    odkaz.title = 'skrýt';
    if (obrazek != '') {
      document.getElementById(obrazek).src = './images/up.png';
    }
  } else {
    document.getElementById(elementID).style.display = 'none';
    odkaz.title = 'zobrazit';    
    if (obrazek != '') {
      document.getElementById(obrazek).src = './images/down.png';
    }    
  } 
  
  return false;
}