function Clock() {
 var el = document.all("spantime");
 var today   = new Date();
 var day	 = today.getDate();
 var month	 = today.getMonth() + 1;
 var year	 = today.getYear();
 var hours   = today.getHours();
 var minutes = today.getMinutes();
 var seconds = today.getSeconds();
   timeValue = day + "." + month + "." + year + "  "+ hours;
   timeValue += ((minutes < 10) ? ":0" : ":") + minutes;
   timeValue += ((seconds < 10) ? ":0" : ":") + seconds;
   el.innerText = timeValue;
   timer = setTimeout("Clock()",1000);
 }

 function skryt(objekt) {
 var prihlaseni = document.all(objekt);
 prihlaseni.style.visibility = "hidden";
 }
 
 function zobrazit(objekt) {
 //alert("aa");
 var prihlaseni = document.all(objekt);
 prihlaseni.style.visibility = "visible";
 }