function defaultSearch(cb) {
  var url = "http://catalog.video.msn.com/videoByMarket.aspx?mk=us&sf=WeeklyCount&responseEncoding=json&callbackName="+cb;
  injectJSON(url);
}

function mostRecent(cb) {
  var url = "http://catalog.video.msn.com/videoByMarket.aspx?mk=us&responseEncoding=json&callbackName="+cb;
  injectJSON(url);
}

function sports(cb) {
  var url = "http://catalog.video.msn.com/videoByTag.aspx?mk=us&tag=sports&ps=18&responseEncoding=json&callbackName="+cb;
  // var url = "http://catalog.video.msn.com/search.aspx?mk=us&q=funny&sf=TotalCount&ps=18&responseEncoding=json&callbackName="+cb;
  injectJSON(url);
}

function search(cb, qs) {
  var url = "http://catalog.video.msn.com/search.aspx?mk=us&q="+qs+"&sf=TotalCount&ps=18&responseEncoding=json&callbackName="+cb;
  injectJSON(url);
}

function injectJSON(url) {
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.src = url;
  document.getElementsByTagName('head')[0].appendChild(script);
}