Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
function addlilink(tabs, url, name, id, title, key){
  var na = document.createElement('a');
  na.href = url;
  na.appendChild(document.createTextNode(name));
  var li = document.createElement('li');
  if(id) li.id = id;
  li.appendChild(na);
  tabs.appendChild(li);
  if(id) {
    if(key && title) {
      ta[id] = [key, title];
    } else if(key) {
      ta[id] = [key, ''];
    } else if(title) {
      ta[id] = ['', title];
    }
  }
  // re-render the title and accesskeys from existing code in wikibits.js
  akeytt();
  return li;
}

// STATUS CHANGER
addOnloadHook(function (){
  var user = document.getElementById( 'pt-userpage' ).firstChild.firstChild.data;
  var subpage = "/Status";
  var scheme = "/StatusTemplate";
  var linkprefix = "http://en.wikipedia.org/w/index.php?title=User:";
  var contribs = document.getElementById( 'pt-mycontris' );
  //Add the links
  addlilink(contribs, linkprefix+user+subpage+"&action=edit&newstatus=in", "In", "pt-status-in", "I'm in!", "");
  addlilink(contribs, linkprefix+user+subpage+"&action=edit&newstatus=busy", "Busy", "pt-status-busy", "I'm busy!", "");
  addlilink(contribs, linkprefix+user+subpage+"&action=edit&newstatus=out", "Out", "pt-status-out", "I'm out!", "");
  if (location.href.indexOf("&action=edit&newstatus=") == -1) return; //Are we here to auto-edit the status?
  //Get new status
  statusRegExp = /&action=edit&newstatus=(.*)/;
  status = statusRegExp.exec(location.href)[1];
  //Modify the form
  document.getElementById('wpTextbox1').value = "{{User:"+user+scheme+"|"+status+"}}";
  document.getElementById('wpSummary').value = "Status: "+status;
  document.getElementById('wpMinoredit').checked = 'checked';
  //Submit it!
  document.getElementById('editform').submit();
});

//