function validateEmail(email){
  var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  return reg.test(email);
}

function checkEmail(emailid) {
  var address = document.getElementById(emailid).value;
   if ((validateEmail(address) == false)) {
      document.getElementById(emailid).focus();
      document.getElementById(emailid).className = "inputBox error";
      return false;
   }else{
      document.getElementById(emailid).className = "inputBox";
      return true;
   }
}

function checkField(name){
  if (document.getElementById(name).value==""){
    document.getElementById(name).className = "inputBox error";
    return false;
  }else{
    document.getElementById(name).className = "inputBox";
    return true;
  }
}

function composeOutput(){
  var outputstream = '<h1>Nezávazná poptávka</h1>';
  outputstream += 'Jméno: <b>' + document.getElementById('jmeno').value + '</b><br>';
  outputstream += 'Telefon: <b>' + document.getElementById('telefon').value + '</b><br>';
  outputstream += 'Email: <b>' + document.getElementById('email').value + '</b><br>';
  outputstream += 'Adresa: <b>' + document.getElementById('adresa').value + '</b><br>';
  outputstream += 'Poptávka: <br>';
  outputstream += '<b>' + document.getElementById('poptavka').value + '</b>';
  document.getElementById('obsah').value=outputstream;
}

function check(){
  if ((checkEmail('email')) && (checkField('jmeno')) && (checkField('adresa')) && (checkField('poptavka'))){
    composeOutput();
    return true;
  }else{
    alert('Vyplňte správně všechny požadované informace!');
    return false;
  }
}

function send(){
   //document.getElementById('epop').submit();
   if (check() == true) {
   document.getElementById('informix2').style.display = 'block';
   setTimeout('clear()', 2000);
   return true;
   } else {
   return false;
   }
}

function clear(){
  document.getElementById('informix2').style.display = 'none';
  document.getElementById('button2').disabled = true;
  document.getElementById('jmeno').disabled = true;
  document.getElementById('telefon').disabled = true;
  document.getElementById('email').disabled = true;
  document.getElementById('adresa').disabled = true;
  document.getElementById('poptavka').disabled = true;
  document.getElementById('button2').value = 'Poptávka odeslána.';
}