function popis_pruh(text){
 document.getElementById('pruh').innerHTML = text;
 document.getElementById('pruh').style.color = '#000000';
}
function vrat_pruh(color){
 document.getElementById('pruh').innerHTML = document.getElementById('pruhtext').value;
 document.getElementById('pruh').style.color = color;
}
function open_obr_win(obr,sir,vys,pop){
  if(!obr || obr == "none"){
    sir = 100;
    vys = 100;
  }

  var scrsir = screen.availWidth;
  var scrvys = screen.availHeight;

  if(pop) vys = parseInt(vys)+18;
  var zobr_obr = "zobr_obr.php?obr="+obr;
  if(pop) zobr_obr += "&pop="+pop;

  var zmena = false;
  if(vys > scrvys){
    sir = Math.round((scrvys/vys)*sir);
    vys = scrvys;
    zmena = true;
  }
  if(sir > scrsir){
    vys = Math.round((scrsir/sir)*vys);
    sir = scrsir;
    zmena = true;
  }
  if(zmena){
    zobr_obr += "&sir="+sir+"&vys="+vys;
  }

  var hor = Math.round((scrvys - vys)/2);
  var lev = Math.round((scrsir - sir)/2);
  if(hor < 0) hor = 0;
  if(lev < 0) lev = 0;

  var obrokynko = window.open(zobr_obr,'obrokynko','top='+hor+', left='+lev+', width='+sir+', height='+vys+', scrollbars=auto');
  obrokynko.focus();
}
function mejl(mejlik){
  var sir = 450;
  var vys = 350;
  var lev = Math.floor((screen.width - sir)/2);
  var hor = Math.floor((screen.height - vys)/2)-100;
  if(lev < 0) lev = 0;
  if(hor < 0) hor = 0;

  var mejlokno = window.open('mejl/mejl.php?mejlik='+mejlik,'mejlokno','top='+hor+', left='+lev+', width='+sir+', height='+vys+', scrollbars=auto');
  mejlokno.focus();
}
function zobr_smenu(ide){
 document.getElementById('m'+ide).className = 'a';
 document.getElementById('sm'+ide).style.visibility = 'visible';
 var pocets = document.getElementById('pocs'+ide).value;
 for(i = 0 ; i < pocets ; i++){
   document.getElementById('sm'+ide+'_'+i).style.visibility = 'visible';
   document.getElementById('sm'+ide+'_'+i).style.position = 'relative';
 }
}
function skryj_smenu(ide){
 document.getElementById('m'+ide).className = document.getElementById('mc'+ide).value;
 document.getElementById('sm'+ide).style.visibility = 'hidden';
 var pocets = document.getElementById('pocs'+ide).value;
 for(i = 0 ; i < pocets ; i++){
   document.getElementById('sm'+ide+'_'+i).style.visibility = 'hidden';
   document.getElementById('sm'+ide+'_'+i).style.position = 'absolute';
 }
}

 function ZobrazOkno(){
   var winsirka = screen.availWidth;
   var winvyska = screen.availHeight;
   var okrajpl = winsirka - 407;
   var okrajhd = winvyska - 283;
   var okrajl = okrajpl / 2;
   var okrajh = (okrajhd / 2) - 100;
   document.getElementById('okno').style.visibility = "visible";
   document.getElementById('okno').style.left = okrajl;
   document.getElementById('okno').style.top = okrajh;
 }
 function SkryjOkno(){
   document.getElementById('okno').style.visibility = "hidden";
 }