var index=1;
var pauza=false;

function setNaslovna(){
    if(!pauza){
        el=document.getElementById('slide'+index);
        el.style.display='none';         
        tab=document.getElementById('tab'+index);
        tab.style.display='none';
        index=index+1;
        if(index==21)index=1;                           
        el=document.getElementById('slide'+index);
        el.style.display='block';              
        tab=document.getElementById('tab'+index);
        tab.style.display='block';
        for(i=1;i<=20;i++){
            tab=document.getElementById('tab'+i);
            if(i==index){
                tab.style.display='block';
            }else{
                tab.style.display='none';
            }
        }
    }
    setTimeout(setNaslovna,3000);
}

function setPauzaOff(){
    pauza=false;
} 

function setPauzaOn(){
    pauza=true;
    setTimeout(setPauzaOff,10000);
}

function prikaziTab(ind){
    var el=document.getElementById('slide'+index);
    el.style.display='none';          
    var tab=document.getElementById('tab'+index);
    tab.style.display='none';
    index=ind;
    el=document.getElementById('slide'+ind);
    el.style.display='block';        
    var tab=document.getElementById('tab'+index);
    tab.style.display='block';
} 

function backgroundOn(ind){
    var el=document.getElementById('tab'+ind);
    el.style.backgroundColor='#77A6EE';
}

function backgroundOff(ind){
    var el=document.getElementById('tab'+ind);
    el.style.backgroundColor='#E0E2FF';
}