Remove a Deviant from Group Watch

// ==UserScript==
// @name           My DA REMOVE UNWANTED DEVIANT Script >:(
// @description    I watch a group on DA... but there is one guy I can't stand... this auto deletes him
// @author         Alcuinus
// @include        http://*.deviantart.com/messages*
// @version        1.0
// ==/UserScript==

// Alcuinus: Tested in chrome
// [name]: Tested in [browser]

document.getElementsByClassName("messages-right")[0].addEventListener('DOMSubtreeModified', function(e){

  if (e.target.host.substr(0,e.target.host.indexOf(".")) == "devianttoremove")
  {
    var obj = e.target;
    while (obj.className != "ch-ctrl mc-ctrl"){
      obj = obj.parentNode;
    }
    obj = obj.getElementsByClassName("mcx")[0];
    var evt = document.createEvent("HTMLEvents");
    evt.initEvent("click", true, true);
    obj.dispatchEvent(evt);
  }

}, false);