function zmen_jazyk(lang) {
var puv, novy;

novy = "/"+lang+"/";

if (location.href.indexOf("/cz/") > 1) puv = "/cz/";
else if (location.href.indexOf("/en/") > 1) puv = "/en/";
else if (location.href.indexOf("/nl/") > 1) puv = "/nl/";

if (novy != puv) location.href = location.href.replace(puv, novy);

}