greaterfool.ca hide Mark

// ==UserScript==
// @name        Greaterfool - hide Mark
// @namespace   blahblah
// @include     http://*.greaterfool.ca*
// @description Hide Posts from Mark
// @version     1
// @grant       none
// ==/UserScript==
function hideMark()
{
var tags = document.getElementsByTagName('strong');
for (var i = 0; i < tags.length; i++)
  if(tags[i].textContent == "Mark ")
  {
    //tags[i].style.display = 'none';
    tags[i].parentNode.style.display = 'none';
    tags[i].parentNode.nextElementSibling.style.display = 'none';
  }
}

hideMark();