window.onresize = showOrHideRightDiv; windowdeactivated.onload = showOrHideRightDiv;

function getWindowWidth() {

if (window.innerWidth) {
  return window.innerWidth;
} else if (document.body && document.body.offsetWidth) {
  return document.body.offsetWidth;
} else {
  return 0;
}

}

function showOrHideRightDiv() {

if(getWindowWidth() > 1100) {
  document.getElementById('right').style.display = 'inline';
} else {
  document.getElementById('right').style.display = 'none';
}

}