version = navigator.appVersion.toLowerCase();
agent = navigator.userAgent.toLowerCase();
ie = (version.indexOf('msie')>-1);
win = (version.indexOf('windows')>-1);
opera = (agent.indexOf('opera')>-1);
ie50 = (version.indexOf('msie 5.0')>-1);

function prn() {
document.write(' \074span class\=\"separator\"\076\&loz\;\074/span\076 \074a href=\"javascript:goprn();\"\076Vytisknout\074/a\076');
}
function wtdprn() {
document.write(' \074span class\=\"separator\"\076\|\074/span\076 \074a href=\"javascript:goprn();\"\076Vytisknout\074/a\076');
}
function goprn() {
window.print();
}
function fav() {
if ((opera) && (win)) return false;
else if ((ie) && (win)) document.write(' \074span class\=\"separator\"\076\&loz\;\074/span\076 \074a href=\"javascript:gofav();\"\076Přidat do záložek\074/a\076');
}
function gofav() {
window.external.addFavorite('http://www.macronsoftware.com/','Macron Software');
}

function wtdfav() {
if ((opera) && (win)) return false;
else if ((ie) && (win)) document.write('\074span class\=\"separator\"\076\|\074/span\076 \074a href=\"javascript:wtdgofav();\"\076Přidat do záložek\074/a\076');
}
function wtdgofav() {
window.external.addFavorite('http://www.webtodate.cz','WebToDate - internetový publikační systém');
}

function zkontroluj_email(adresa)
{
  re = /^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,4}$/;
  return adresa.search(re) == 0;
}

function zkontroluj_formular(obj)
{
  if (!zkontroluj_email(obj.email.value))
  {
    alert("Zadejte emailovou adresu ve správném formátu!");
    return false;
  }
  return true;  
}