function openWindow2(url, name, width, height) {
  width = width + 20;
  height = height + 20;
  params = "width="+width+",height="+height+",status,resizable,left=25,right=25,scrollbars=no";
  window.open(url, '', params)
}

function checkForm() {
  errmsg = "";
  
  if (document.getElementById('jmeno').value == '') errmsg += 'Je třeba zadat jméno.\n';
  //if (document.getElementById('tel').value == '') errmsg += 'Je třeba zadat telefon.\n';
  if (!checkMail(document.getElementById('email').value)) errmsg += 'Je třeba zadat funkční email.\n';
  
  if (errmsg != "") {
    alert(errmsg);
    return false;
  }
  else {
    if (document.getElementById('poptavka_form_kamnarstvi').style.display == "none") {
      document.getElementById('typ_poptavky').value = "podlaharstvi";
    }
    else {
      document.getElementById('typ_poptavky').value = "kamnarstvi";
    }
    return true;
  }
}

function checkMail(email) {
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(email)) return true;
	else return false;
}

function changeForm(typ) {
  if (typ == 'podlaharstvi') {
    document.getElementById('poptavka_form_kamnarstvi').style.display = "none";
    document.getElementById('poptavka_form_podlaharstvi').style.display = "block";
  }
  else if (typ == 'kamnarstvi') {
    document.getElementById('poptavka_form_podlaharstvi').style.display = "none";
    document.getElementById('poptavka_form_kamnarstvi').style.display = "block";
  }
}