var divHeight = document.getElementById('videoplayer_description').offsetHeight;
//max height of 45
  if(divHeight > 45){
   document.getElementById("videoplayer_description").style.display = 'none';
   document.getElementById("videoplayer_overflow").style.display = 'block';
   document.getElementById("expand_btn").style.display = 'block';
  }
  function expander(){
   document.getElementById("videoplayer_overflow").style.display = 'none';
   document.getElementById("expand_btn").style.display = 'none';
   document.getElementById("big_description").style.display = 'block';
   document.getElementById("contract_btn").style.display = 'block';
  }
  function contracter(){
   document.getElementById("videoplayer_overflow").style.display = 'block';
   document.getElementById("expand_btn").style.display = 'block';
   document.getElementById("big_description").style.display = 'none';
   document.getElementById("contract_btn").style.display = 'none';
  }