function hidebox(x) {
 if(document.getElementById(x).style.display=='block') {
  document.getElementById(x).style.display='none';
 }
}
function closebox() {
 hidebox('osobni');
 hidebox('oblibene');
 hidebox('nazory');
}
function openbox(x) {
 closebox();
 document.getElementById(x).style.display='block';
}