function oznacit(id,act) {
 var req=GetXMLHttpRequest();

 if(req) {
  req.open('GET','/oznacit.php?id='+id+'&act='+act,true);

  req.send('');
  if(act) oznacenych++;
  else oznacenych--;
  var o=document.getElementById('vb');
  if(oznacenych) o.style.display='block';
  else o.style.display='none';
  var o=document.getElementById('vb2');
  o.innerHTML='<span>('+oznacenych+')</span>';
  var o=document.getElementById('vb3');
  o.innerHTML='<span>('+oznacenych+')</span>';
 }
}
function opp(p) {
 var f=document.getElementById('z'+p);
 var pos=findPos(f);
 var t=pos[1]-200;
 var req=GetXMLHttpRequest();
 if(req) {
 
  req.onreadystatechange = function () {

   if(req.readyState==4) {
    var o=document.getElementById('pobtt');
    o.innerHTML=req.responseText;
    var o=document.getElementById('pob');
    o.style.display='block';
    o.style.top=t+'px';
   }
  }
  req.open("GET","/pobocky.php?idx="+p,true);
  req.send("");
 }
}
function tisko() {
 var w=1000;
 var h=740;
 window.open('/tiskozn.php','','left='+(screen.width-w)/2+',top='+(screen.height-h)/2+',width='+w+',height='+h+',toolbar=no,resizable=yes,scrollbars=yes,status=no'); 
}