var realiz;

function openCentered(theURL,winName,winWidth,winHeight,features) {
       
       if (realiz) {
         realiz.close();
       }
       
       var w = (screen.width - winWidth)/2;
       var h = (screen.height - winHeight)/2 - 30;
       features = features+',width='+winWidth+',height='+winHeight+',top='+h+',left='+w;
       realiz = window.open(theURL,winName,features);
       realiz.focus();
}


function jazyk(nazev) {
	  var el = document.getElementById("nazevJazyka");
	  el.innerHTML = nazev;
}