export function addClass(element: HTMLElement, className: string) {
  if (element.classList) {
    element.classList.add(className);
  } else {
    element.className += ' ' + className;
  }
}

export function removeClass(element: HTMLElement, className: string) {
  if (element.classList) {
    element.classList.remove(className);
  } else {
    element.className = element.className.replace(new RegExp('(^|\\b)' + className.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');
  }
}