function reseni(){
    document.getElementById('clankytab').className='';
    document.getElementById('resenitab').className='';
    document.getElementById('studietab').className='';
    
    document.getElementById('reseni').style.display=('block');
    document.getElementById('studie').style.display=('none');
    document.getElementById('clanky').style.display=('none');
    document.getElementById('resenitab').className='tab-active';
};

function studie(){
    document.getElementById('clankytab').className='';
    document.getElementById('resenitab').className='';
    document.getElementById('studietab').className='';
    
    document.getElementById('reseni').style.display=('none');
    document.getElementById('studie').style.display=('block');
    document.getElementById('clanky').style.display=('none');
    document.getElementById('studietab').className='tab-active';
};

function clanky(){
    document.getElementById('clankytab').className='';
    document.getElementById('resenitab').className='';
    document.getElementById('studietab').className='';
            
    document.getElementById('reseni').style.display=('none');
    document.getElementById('studie').style.display=('none');
    document.getElementById('clanky').style.display=('block');        
    document.getElementById('clankytab').className='tab-active';        
      
};

function aktuality(){
    document.getElementById('aktualitytab').className='';
    document.getElementById('zamestnanitab').className='';
    
    document.getElementById('aktuality').style.display=('block');
    document.getElementById('zamestnani').style.display=('none');
    document.getElementById('aktualitytab').className='tab-active';
};

function zamestnani(){
    document.getElementById('aktualitytab').className='';
    document.getElementById('zamestnanitab').className='';
    
    document.getElementById('aktuality').style.display=('none');
    document.getElementById('zamestnani').style.display=('block');
    document.getElementById('zamestnanitab').className='tab-active';
};

function whoislogio(){   
    document.getElementById('whoislogio').className='tab-active';
};