var timerID = null;
var timerRunning = false;
var logTime = false;
var logSeconds = 0;
var logMinutes = 0;

function CatchChar(){
  if( window.event.keyCode == 13)	window.event.returnValue = false;
}

function CatchCharNum(){
  if( window.event.keyCode < 48 )	window.event.returnValue = false;
  if( window.event.keyCode > 57 )	window.event.returnValue = false;
}

function SetFocus(idx){
//fokusátor
  window.document.forms['vkladani'].elements[idx].focus();       
}

function StartClock ()
{
  stopclock();
  time();
}

function stopclock ()
{
  if(timerRunning) clearTimeout(timerID);
  timerRunning = false;
}

function time ()
{
  logTime = true
  logSeconds += 1;
if (logSeconds >= 60)
{
  logMinutes += 1;
  logSeconds = 0;
}
var mm = ( (23 - logMinutes < 10) ? "00:0" : "00:" ) + (23 - logMinutes);
var ss = ( (59 - logSeconds < 10) ? ":0" : ":") + (59 - logSeconds);
var mmss=mm+ss;
document.forms['cas'].elements['limit'].value = mmss;
timerID = setTimeout("time()",1000);
timerRunning = true;
if(mmss=='00:00:00'){ 
   stopclock();
	 document.forms['cas'].elements['limit'].value ='00:00:00';
	}
}

 function show_help(langu,pagina) {
 //,scrollbars=yes
  var url = '~help.php?jaz='+langu+'&str='+pagina
  window.open(url,null,"height=600,width=800,status=no,toolbar=no,menubar=no,location=no",false)
  }