function osetreni(registration_form){
if (registration_form.jmeno.value=="")
{
  alert("Please, enter your Name !");
  registration_form.jmeno.focus();
  return false;
}
else if (registration_form.prijmeni.value=="")
{
  alert("Please, enter your Surname !");
  registration_form.prijmeni.focus();
  return false;
}
else if (registration_form.ulice.value=="")
{
  alert("Please, enter Street/no. !");
  registration_form.ulice.focus();
  return false;
}
else if (registration_form.mesto.value=="")
{
  alert("Please, enter city !");
  registration_form.mesto.focus();
  return false;
}
else if (registration_form.psc.value=="")
{
  alert("Please, enter post code !");
  registration_form.psc.focus();
  return false;
}
else if (registration_form.telefon.value=="")
{
  alert("Please, enter phone number !");
  registration_form.telefon.focus();
  return false;
}
else if(registration_form.email.value=="")
{
  alert("Please, enter e-mail !");
  registration_form.email.focus();
  return false;
}
else if(window.RegExp)
{
  re=new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
  if(!re.test(registration_form.email.value))
  {
    alert("The entered address does not correspond with the electronic post address !");
	   registration_form.email.focus();
	   return false;
  }
}
else 
  return true;
}

function validate(obj_form){
if (obj_form.jmeno.value=="")
{
  alert("Please, enter your first name !");
  obj_form.jmeno.focus();
  return false;
}
else if (obj_form.prijmeni.value=="")
{
  alert("Please, enter your last name !");
  obj_form.prijmeni.focus();
  return false;
}
else if (obj_form.ulice.value=="")
{
  alert("Please, enter street !");
  obj_form.ulice.focus();
  return false;
}
else if (obj_form.mesto.value=="")
{
  alert("Please, enter city !");
  obj_form.mesto.focus();
  return false;
}
else if (obj_form.psc.value=="")
{
  alert("Please, enter post code !");
  obj_form.psc.focus();
  return false;
}
else if (obj_form.telefon.value=="")
{
  alert("Please, enter phone number !");
  obj_form.telefon.focus();
  return false;
}
else if ((!obj_form.platba[0].checked) && (!obj_form.platba[1].checked) && (!obj_form.platba[2].checked))
{
  alert("Please, fill in payment !");
  obj_form.platba[0].focus();
  return false;
}
else if(obj_form.email.value=="")
{
  alert("Please, enter e-mail !");
  obj_form.email.focus();
  return false;
}
else if(window.RegExp)
{
  re=new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
  if(!re.test(obj_form.email.value))
  {
    alert("The entered address does not correspond with the electronic post address !");
	   obj_form.email.focus();
	   return false;
  }
}
else 
  return true;
}

// kontrola formulare pro odeslani emailu
function validate_send_mail(formular)
{
	if(formular.email_news.value=="vas@email.cz")
	{
 		alert("Nesprávný formát pole !");
  	formular.email_news.focus();
  	return false;
	}
	if(window.RegExp)
	{
	  re=new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
  	if(!re.test(formular.email_news.value))
  	{
  	  alert("The entered address does not correspond with the electronic post address !");
	  	formular.email_news.focus();
	  	return false;
  	}
	}
	else {
  	return true;
	}
}

//-->