// Preload image - incase they are large images.
if(document.images){
  var main = new Image(); main.src = "images/popisky/main.jpg";
  var img1 = new Image(); img1.src = "images/popisky/01.jpg";
  var img2 = new Image(); img2.src = "images/popisky/02.jpg";
  var img3 = new Image(); img3.src = "images/popisky/03.jpg";
  var img4 = new Image(); img4.src = "images/popisky/04.jpg";
  var img5 = new Image(); img5.src = "images/popisky/05.jpg";
  var img6 = new Image(); img6.src = "images/popisky/06.jpg";
  var img7 = new Image(); img7.src = "images/popisky/07.jpg";
  var img8 = new Image(); img8.src = "images/popisky/08.jpg";
  var img9 = new Image(); img9.src = "images/popisky/09.jpg";
  var img10 = new Image(); img10.src = "images/popisky/10.jpg";
  var img11 = new Image(); img11.src = "images/popisky/11.jpg";
  var img12 = new Image(); img12.src = "images/popisky/12.jpg";
  var img13 = new Image(); img13.src = "images/popisky/13.jpg";
  var img14 = new Image(); img14.src = "images/popisky/14.jpg";
  var img15 = new Image(); img15.src = "images/popisky/15.jpg";
  var img16 = new Image(); img16.src = "images/popisky/16.jpg";
  var img17 = new Image(); img17.src = "images/popisky/17.jpg";
  var img18 = new Image(); img18.src = "images/popisky/18.jpg";
  var img19 = new Image(); img19.src = "images/popisky/19.jpg";
  var img20 = new Image(); img20.src = "images/popisky/20.jpg";
  var img21 = new Image(); img21.src = "images/popisky/21.jpg";
  var img22 = new Image(); img22.src = "images/popisky/22.jpg";
  var img23 = new Image(); img23.src = "images/popisky/23.jpg";
  var img24 = new Image(); img24.src = "images/popisky/24.jpg";
  var img25 = new Image(); img25.src = "images/popisky/25.jpg";
  var img26 = new Image(); img26.src = "images/popisky/26.jpg";
  var img27 = new Image(); img27.src = "images/popisky/27.jpg";
  var img28 = new Image(); img28.src = "images/popisky/28.jpg";
  var img29 = new Image(); img29.src = "images/popisky/29.jpg";
  var img30 = new Image(); img30.src = "images/popisky/30.jpg";
  var img31 = new Image(); img31.src = "images/popisky/31.jpg";
  var img32 = new Image(); img32.src = "images/popisky/32.jpg";
  var img33 = new Image(); img33.src = "images/popisky/33.jpg";
  var img34 = new Image(); img34.src = "images/popisky/34.jpg";
  var img35 = new Image(); img35.src = "images/popisky/35.jpg";
  var img36 = new Image(); img36.src = "images/popisky/36.jpg";
  var img37 = new Image(); img37.src = "images/popisky/37.jpg";
  var img38 = new Image(); img38.src = "images/popisky/38.jpg";
  var img39 = new Image(); img39.src = "images/popisky/39.jpg";
  var img40 = new Image(); img40.src = "images/popisky/40.jpg";
  var img41 = new Image(); img41.src = "images/popisky/41.jpg";
  var img42 = new Image(); img42.src = "images/popisky/42.jpg";
  var img43 = new Image(); img43.src = "images/popisky/43.jpg";
  var img44 = new Image(); img44.src = "images/popisky/44.jpg";
  var img45 = new Image(); img45.src = "images/popisky/45.jpg";
  var img46 = new Image(); img46.src = "images/popisky/46.jpg";
  var img47 = new Image(); img47.src = "images/popisky/47.jpg";
  var img48 = new Image(); img48.src = "images/popisky/48.jpg";
  var img49 = new Image(); img49.src = "images/popisky/49.jpg";  
  var img50 = new Image(); img50.src = "images/popisky/50.jpg";
  var img51 = new Image(); img51.src = "images/popisky/51.jpg";
  var img52 = new Image(); img52.src = "images/popisky/52.jpg";
  var img53 = new Image(); img53.src = "images/popisky/53.jpg";
  var img54 = new Image(); img54.src = "images/popisky/54.jpg";
  var img55 = new Image(); img55.src = "images/popisky/55.jpg";
  var img56 = new Image(); img56.src = "images/popisky/56.jpg";
  var img57 = new Image(); img57.src = "images/popisky/popis_kali.jpg";
  var img58 = new Image(); img58.src = "images/popisky/57.jpg";
  var img59 = new Image(); img59.src = "images/popisky/58.jpg";
  var img60 = new Image(); img60.src = "images/popisky/59.jpg";
}

function change(imageName){
  if(document.images){ document['main'].src = eval(imageName + ".src"); }
}

function changeBack(){
  if(document.images){ document['main'].src = main.src; }
}