Strike through known artists

known.user.js

// i'm just savin' this for later

function magic(json){
  var a = {}

  for(var i in json["topartists"]["artist"]){
    a[json["topartists"]["artist"][i]["name"]]=true;
  }

  var tds = document.getElementsByClassName("subjectCell");

  for(var i in tds){
    var e=tds[i].getElementsByTagName("a")[0];
    var artist=e.innerText;
    if(a[artist]) {
      e.style.textDecoration = 'line-through'
    }
  }
}

xhr.onreadystatechange = function() {
  if(xhr.readyState==4){
    magic(JSON.parse(xhr.responseText));
  }
}

xhr.open("GET", "http://ws.audioscrobbler.com/2.0/?method=user.gettopartists&user=arekolek&api_key=b25b959554ed76058ac220b7b2e0a026&limit=500&format=json", true);

xhr.send();