function cas_on()
{ dnes=new Date();
  with (dnes)
   { hour=getHours();
     minute=getMinutes();
     second=getSeconds();
   }  
   times=hour;
   times+=((minute<10) ? ":0" : ":")+minute;
   times+=((second<10) ? ":0" : ":")+second;
   document.all["cas"].innerText=times;
   window.setTimeout("cas_on()",500);
}

function zvetsi(imgsrc)
{ windowHandle = window.open('../../img/'+imgsrc+'.gif','_blank0','toolbar=no,location=no,directories=no,status=no,resizable=yes,menubar=no,scrollbars=yes,top=0,left=0,width=790,height=600');
  windowHandle.focus() }