no-jq.js

function toggleClass(el, _class) {
  if (el && el.className && el.className.indexOf(_class) >= 0) {
    var pattern = new RegExp('\\s*' + _class + '\\s*');
    el.className = el.className.replace(pattern, ' ');
  }
  else if (el){
    el.className = el.className + ' ' + _class;
  }
  else {
    console.log("Element not found :(")
  }
}

var dH = Math.max( body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight);
var sT = (window.pageYOffset !== undefined) ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;

function removeClass(el, _class) {
  if (el && el.className && el.className.indexOf(_class) >= 0) {
    var pattern = new RegExp('\\s*' + _class + '\\s*');
    el.className = el.className.replace(pattern, ' ');
  }
}
function addClass(el, _class){
  if (el.classList){
    el.classList.add(_class); 
  } else {
   el.className += ' ' + _class; 
  }
}