var headline_interval = 3000;
var aktivny_headline = 1;
var aktivny_headline_img = 1;
var headline_casovac = null;
var headline_casovac_in = null;
var headline_prepinac_over = false;

function prepinanie(over){
  headline_prepinac_over = over;
}

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

function headline_out(){  
  var dalsi = aktivny_headline;
  var dalsi_img = aktivny_headline_img;
  
  if(document.getElementById('fotka_box_'+aktivny_headline+'_'+(aktivny_headline_img+1)) != null){
    dalsi_img = aktivny_headline_img+1; 
  }
  else if(document.getElementById('fotka_box_'+(aktivny_headline+1)+'_1') != null){
    dalsi = aktivny_headline+1;
    dalsi_img = 1;    
  } 
  else{
    dalsi = 1;
    dalsi_img = 1;
  } 
  
  clearTimeout(headline_casovac);
  clearTimeout(headline_casovac_in);
  headline_casovac = setTimeout('prepinanie_headlinov('+dalsi+','+dalsi_img+',false)',headline_interval);
}

function prepinanie_headlinov(i,j,mys){
  clearTimeout(headline_casovac);
  clearTimeout(headline_casovac_in);
  
  var dalsi = i;
  var dalsi_img = j;
  headline(i,j,mys);
  if(headline_prepinac_over || mys){
    if(document.getElementById('fotka_box_'+i+'_'+(j+1)) != null)
      dalsi_img = j+1;
    else
      dalsi_img = 1;
    
    if(j != dalsi_img){
      headline_casovac_in = setTimeout('prepinanie_headlinov('+dalsi+','+dalsi_img+',false)',headline_interval);  
    }
  }
  else{
    if(document.getElementById('fotka_box_'+i+'_'+(j+1)) != null){
      dalsi_img = j+1; 
    }
    else if(document.getElementById('fotka_box_'+(i+1)+'_1') != null){
      dalsi = i+1;
      dalsi_img = 1;    
    } 
    else{
      dalsi = 1;
      dalsi_img = 1;
    } 
    
    headline_casovac = setTimeout('prepinanie_headlinov('+dalsi+','+dalsi_img+',false)',headline_interval); 
  }
}

function headline(poradie,poradie_img,mys){
  if(document.getElementById('headline_popis_'+aktivny_headline) != null && aktivny_headline != poradie)
    document.getElementById('headline_popis_'+aktivny_headline).style.display = 'none';
  if(mys && document.getElementById('headline_popis_'+poradie) != null)
    document.getElementById('headline_popis_'+poradie).style.display = 'block';
    
  if(poradie != aktivny_headline || poradie_img != aktivny_headline_img){
    document.getElementById('fotka_box_'+poradie+'_'+poradie_img).style.zIndex = 10;
    document.getElementById('fotka_box_'+aktivny_headline+'_'+aktivny_headline_img).style.zIndex = 9;
    alpha('fotka_box_'+poradie+'_'+poradie_img,100,0);
    alpha('fotka_box_'+aktivny_headline+'_'+aktivny_headline_img,0,100);
  }
  
  document.getElementById('headline_tab_'+aktivny_headline).className = '';
  document.getElementById('headline_tab_'+poradie).className = 'active';
  
  aktivny_headline = poradie;
  aktivny_headline_img = poradie_img;

}