var headline_interval = 3000;
var aktivny_headline = 1;
var pocet_obrazkov = 1;

function spustit_headliny(){
   setTimeout('prepinanie_headlinov('+aktivny_headline+')',headline_interval);  
}

function prepinanie_headlinov(cislo){
  if(pocet_obrazkov > 1){
    var dalsi_headline = Math.round(Math.random()*(pocet_obrazkov-1))+1;
    while(dalsi_headline == cislo)
      dalsi_headline = Math.round(Math.random()*(pocet_obrazkov-1))+1;
    headline(dalsi_headline);
    setTimeout('prepinanie_headlinov('+dalsi_headline+')',headline_interval);
  }
}

function headline(poradie){
  if(poradie != aktivny_headline){
    document.getElementById('head_image_'+poradie).style.zIndex = 10;
    document.getElementById('head_image_'+aktivny_headline).style.zIndex = 9;
    alpha('head_image_'+poradie,100,0);
    alpha('head_image_'+aktivny_headline,0,100);
  }

  aktivny_headline = poradie;
}