function hideterkepslide() {
  document.getElementById('slide').style.display = "none";
  document.getElementById('slide_btn').style.textDecoration = 'underline';
  document.getElementById('terkep_btn').style.textDecoration = 'none';
}

function showterkepslide() {
  document.getElementById('slide').style.display = "block";
  document.getElementById('terkep_btn').style.textDecoration = 'underline';
  document.getElementById('slide_btn').style.textDecoration = 'none';
}