var duration = 4; // Jak dlouho fotografie zustane zobrazena (v sekundach)

jQuery.noConflict();
jQuery(document).ready(function(){
(function($) {
  $(function() {
    headers = new Array();
    headers[0] = "header01.jpg";
    headers[1] = "header02.jpg";
    headers[2] = "header03.jpg";
    headers[3] = "header04.jpg";
    headers[4] = "header05.jpg";
    headers[5] = "header06.jpg";
    headers[6] = "header07.jpg";
    headers[7] = "header08.jpg";
    headers[8] = "header09.jpg";
    headers[9] = "header10.jpg";
    headers[10] = "header11.jpg";
    headers[11] = "header12.jpg";

    headersTotal = headers.length - 1;
    currentlyDisplayedHeader = 0;



    $("div.header").css("background-image", "url('headery/"+headers[currentlyDisplayedHeader]+"')");


    $("span.prava-sipka").click(function(){
      if (currentlyDisplayedHeader < headersTotal) {
        currentlyDisplayedHeader += 1;
      }
      else {
        currentlyDisplayedHeader = 0;
      }

      $("div.header").css("background-image", "url('headery/"+headers[currentlyDisplayedHeader]+"')");
      return false;
    });

    $("span.leva-sipka").click(function(){
      if (currentlyDisplayedHeader > 0) {
        currentlyDisplayedHeader -= 1;
      }
      else {
        currentlyDisplayedHeader = headersTotal;
      }

      $("div.header").css("background-image", "url('headery/"+headers[currentlyDisplayedHeader]+"')");
      return false;
    });

    automaticallyDisplayNextHeader(true);

  });
})(jQuery);
});

var t;

function automaticallyDisplayNextHeader(firstRun) {
  if (currentlyDisplayedHeader < headersTotal) {
    currentlyDisplayedHeader += 1;
  }
  else {
    currentlyDisplayedHeader = 0;
  }

  if (firstRun !== true) {
    jQuery("div.header").css("background-image", "url('headery/"+headers[currentlyDisplayedHeader]+"')");
  }

  t = setTimeout("automaticallyDisplayNextHeader()", duration * 1000);
}