function popup(url,jmeno,s,w,h){
  posx=(screen.width-w)/2;
  posy=(screen.height-h)/2;
  window.open(url,jmeno,"resizable=yes,menubar=no,status=no,location=no,toolbar=no,scrollbars="+s+",width="+w+",height="+h+",top="+posy+",left="+posx);
}

function zavri(){
  window.opener.location.reload();
  window.close();
}

function switchcard(show, hide){
  document.getElementById(show).style.display = "block";
  document.getElementById("karta"+show).className = "aktivni";
  for(i=0;i<hide.length;i++) {
    document.getElementById(hide[i]).style.display = "none";  
    document.getElementById("karta"+hide[i]).className = "neaktivni";
  }
}

function insert_smilie(key){
  document.guestbook.g_text.value+= '' + key + '';
}