Source Code:

var vidList = document.getElementById('videoList').getElementsByTagName('li');
var watched = 0;
var notWatched = 0;
var total = vidList.length;
var watchedArr = new Array();
var notWatchedArr = new Array();
for (var vid in vidList) {
  if (vid != "length") {
    var vidTag = document.getElementById(vidList[vid].id);
    if (vidTag != null) {
      var vidSpan = vidTag.getElementsByTagName('span');
      if (vidSpan[1].attributes.getNamedItem('class').value == "PTZ-status PTZ-awarded") {
        watchedArr[watched] = vidList[vid].id;
        watched++;
        } else {
        notWatchedArr[notWatched] = vidList[vid].id;
        notWatched++;
        }
      }
    }
  }

for (var i in watchedArr) {
  document.getElementById(watchedArr[i]).style.display = "none";
  }

for (var i in notWatchedArr) {
  var link = document.getElementById(notWatchedArr[i]);
  link.style.display = 'block';
  link.childNodes[0].setAttribute("onclick", "this.parentNode.style.display = 'none';");
  link.childNodes[0].setAttribute("target", "_blank");
  link.childNodes[1].setAttribute("onclick", "this.parentNode.style.display = 'none';");
  link.childNodes[1].setAttribute("target", "_blank");
  }

if(watched == 0) {
  alert('No videos watched\n\n' + total + ' total');
  }