var ok_imgs = new Array (1, 8, 9, 10, 11, 12, 103, 104, 105, 106, 107, 108);
var anchors = new Array ();

anchors[8] = 'http://www.royalreport.cz/category/srpen-2008/';
anchors[9] = 'http://www.royalreport.cz/casopis/';
anchors[10] = 'http://www.royalreport.cz/casopis/';
anchors[11] = 'http://www.royalreport.cz/casopis/';
anchors[12] = 'http://www.royalreport.cz/category/prosinec-2008/';
anchors[103] = 'http://www.royalreport.cz/category/brezen-2009/'; 
anchors[104] = 'http://www.royalreport.cz/category/duben-2009/';
anchors[105] = 'http://www.royalreport.cz/casopis/';
anchors[106] = 'http://www.royalreport.cz/casopis/';
anchors[107] = 'http://www.royalreport.cz/category/cervenec-2009/';
anchors[108] = 'http://www.royalreport.cz/casopis/';

function in_array(needle, haystack, argStrict) {
  var found = false, key, strict = !!argStrict;
  for (key in haystack) {
    if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
      found = true;
      break;
    }
  }
  return found;
}

function MM_preloadImages() { //v3.0
 var d=document;
 if(d.images){
  if(!d.MM_p) d.MM_p=new Array();
  var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
  if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}
 }
}

function header_next() {
  var img = document.getElementById('header_cover');
  var anch = document.getElementById('header_cover_a');
  now = img.alt * 1 + 1;
  if (in_array(now,ok_imgs)) {
    img.src = 'http://www.royalreport.cz/wp-content/themes/default/header/'+now+'.jpg';
    img.alt = now;
    anch.href = anchors[now];
  } else {
    img.src = 'http://www.royalreport.cz/wp-content/themes/default/header/'+header_closer(now,true)+'.jpg';
    img.alt = header_closer(now,true);
    anch.href = anchors[header_closer(now,true)];
  }
}

function header_prev() {
  var img = document.getElementById('header_cover');
  var anch = document.getElementById('header_cover_a');
  now = img.alt * 1 - 1;
  if (in_array(now,ok_imgs)) {
    img.src = 'http://www.royalreport.cz/wp-content/themes/default/header/'+now+'.jpg';
    img.alt = now;
    anch.href = anchors[now];
  } else {
    img.src = 'http://www.royalreport.cz/wp-content/themes/default/header/'+header_closer(now,false)+'.jpg';
    img.alt = header_closer(now,false);
    anch.href = anchors[now];
  }
}

function header_closer(month, up) {
  if (up) {
    month = month + 1;
    if (month > 112) month = month % 112;
  } else {
    month = month - 1;
    if (month < 1) month = month + 112;
  }
  if (in_array(month,ok_imgs)) return month;
  else return header_closer(month, up);
}

function header_load() {
  MM_preloadImages('http://www.royalreport.cz/wp-content/themes/default/header/1.jpg','http://www.royalreport.cz/wp-content/themes/default/header/2.jpg','http://www.royalreport.cz/wp-content/themes/default/header/3.jpg','http://www.royalreport.cz/wp-content/themes/default/header/4.jpg','http://www.royalreport.cz/wp-content/themes/default/header/5.jpg','http://www.royalreport.cz/wp-content/themes/default/header/6.jpg','header/7.jpg','header/8.jpg','header/9.jpg','header/10.jpg','header/11.jpg','header/12.jpg','header/101.jpg','header/102.jpg','header/103.jpg','header/104.jpg','header/105.jpg','header/106.jpg','header/107.jpg','header/108.jpg','header/109.jpg','header/111.jpg','header/112.jpg');
  var img = document.getElementById('header_cover');
  var anch = document.getElementById('header_cover_a');
  var month = new Date();
  month = month.getMonth()+1;
  if (in_array(month,ok_imgs)) {
    img.src = 'http://www.royalreport.cz/wp-content/themes/default/header/'+month+'.jpg';
    img.alt = month;
    anch.href = anchors[month];
  } else {
    img.src = 'http://www.royalreport.cz/wp-content/themes/default/header/'+header_closer(month,false)+'.jpg';
    img.alt = header_closer(month,false);
    anch.href = anchors[header_closer(month,false)];
  }
}