// ANGLICKE CHYBOVE HLASKY PRO NAVSTEVNI KNIHU
function Smile(what)
{
  document.forms.formik.zprava.focus();
  document.forms.formik.zprava.value=document.forms.formik.zprava.value+what;
  if (what=="<b></b>" || what=="<i></i>" || what=="<u></u>") {
	document.forms.formik.zprava.pos=5;
  }
}

function zkontroluj(formular)
{
	if (formular.jmeno.value=="")
    {
        alert("You have to fill your name!");
        formular.jmeno.focus();
        return false;
    }

	else if (formular.zprava.value=="")
    {
        alert("You have to write the message!");
        formular.zprava.focus();
        return false;
    }

	else if (formular.kod.value=="")
    {
        alert("You have to sum these numbers!");
        formular.kod.focus();
        return false;
    }

	else if (window.RegExp)
    {
        re = new RegExp("^([a-zA-Z0-9_.-]+@([a-zA-Z0-9_-]+\.)+[a-z]{2,4}){0,1}$|^@{1}$");
        if (!re.test(formular.email.value))
        {
            alert("Your email address is not valid!");
            formular.email.focus();
            return false;
        }
    }
    else
        return true;
}