show-content.js

//IE Fix
if (typeof(NodeList.prototype.forEach)!==typeof(alert))
{
    NodeList.prototype.forEach=Array.prototype.forEach;
}


function showContent(id){
  // get all .content elements
  var allDivs = document.getElementsByClassName('content');

  // add .hidden class to all .content elements
  for(var i=0; i< allDivs.length; i++){
    allDivs[i].classList.add('hidden');
  }

  // get element to show
  var div = document.getElementById(id);
  // remove .hidden class
  div.classList.remove('hidden');
}