var headline_interval = 4000;
var aktivny_headline = 1;
var headline_casovac = null;

function headline_over(){
  if(headline_casovac != null)
    clearTimeout(headline_casovac);
}

function headline_out(){
  var dalsi = aktivny_headline+1;
  if(document.getElementById('headline_nadpis_'+dalsi) == null)
    dalsi = 1;
  clearTimeout(headline_casovac);
  headline_casovac = setTimeout('prepinanie_headlinov('+dalsi+')',headline_interval);
}

function prepinanie_headlinov(i){
  headline(i,'over',false);
  var dalsi = i+1;
  if(document.getElementById('fotka_box_'+dalsi) == null)
    dalsi = 1;
  headline_casovac = setTimeout('prepinanie_headlinov('+dalsi+')',headline_interval);
}

function headline(poradie,typ,mys){
  if(typ == 'over'){
    if(aktivny_headline != poradie){
      alpha('fotka_box_'+poradie,100,0);
      alpha('fotka_box_'+aktivny_headline,0,100);
    }
    document.getElementById('headline_tab_'+aktivny_headline).className = '';
    document.getElementById('headline_tab_'+poradie).className = 'active';
    aktivny_headline = poradie;
  }
}