function bar(url)
{
  wasOpen  = false;
  win = window.open(url);    
  return (typeof(win)=='object')?true:false;
}

function checkUserField(){
  if(document.getElementById("userField").value == "Přihlášení se nezdařilo"){
    document.getElementById("userField").value = "";
  }
}

function hideElement(id){
  document.getElementById(id).style.display="none";
}

function showElement(id){
  document.getElementById(id).style.display="block";
}

function isNumberKey(evt)
{
   var charCode = (evt.which) ? evt.which : event.keyCode
   if (charCode > 31 && (charCode < 48 || charCode > 57))
      return false;

   return true;
}

function checkEmpty(id)
{
  if(document.getElementById(id).value == ""){
    document.getElementById(id).value = "1";
  }
}

function changeAllPrice(price)
{
  if(price >= 2000)
  {
    document.getElementById("allPrice").innerHTML = price + " Kč";
  document.getElementById("allPrice2").innerHTML = "Zboží: " + price + " Kč + Poštovné: 0 Kč";
  }else{
    document.getElementById("allPrice").innerHTML = (parseInt(price) + parseInt(document.getElementById('dopravaSelect').value)) + " Kč";
    document.getElementById("allPrice2").innerHTML = "Zboží: " + price + " Kč + Poštovné: " + document.getElementById('dopravaSelect').value + " Kč";
  }
}