function changeMedia(media) {
    if(media == "slideshowMedia") {
      document.getElementById("videoMedia").style.display = "none";
      document.getElementById("viewAd").setAttribute("class", "viewAdsD");
      document.getElementById("viewSlideshow").setAttribute("class", "viewSlideshow");
    } else {
      document.getElementById("slideshowMedia").style.display = "none";
      document.getElementById("viewAd").setAttribute("class", "viewAds");
      document.getElementById("viewSlideshow").setAttribute("class", "viewSlideshowD");
    }
    document.getElementById(media).style.display = "block";
}