gistfile1.js

(function(doc, forEach) {
  var selectNodes = doc.selectNodes || function(xpath, resolver) { // for firefox
    var contextNode = this.ownerDocument || this, out = [], i = 0, node
        ,nodes = contextNode.evaluate(xpath, contextNode, resolver || null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for ( ; node = nodes.snapshotItem(i); i++) {
      out.push(node);
    }
    return out;
  }, length = 0, time, count = 0;
  function duration(secs) {
    var days, hrs, mins;
    if (secs > 86400) {
      days = (seconds / 86400) >>> 0;
      secs %= 86400
    }
    if (secs > 3600) {
      hrs = (secs / 3600) >>> 0;
      secs %= 3600;
    }
    if (secs > 60) {
      mins = (secs / 60) >>> 0;
      secs %= 60;
    }
    return (days ? days + ':' : '') + [pad(hrs),pad(mins),pad(secs)].join(':');
  }
  function pad(int) {
    if (int < 10) return '0' + int;
  }
  forEach.call(selectNodes(doc, '//rhtable//tr/td[4]/text()'), function(node) {
    var array = node.data.split(':');
    length += (array[0] *3600) + (array[1] *60) + (array[2] *1);
    count++;
  });
  time = duration(length);
  forEach.call(selectNodes(doc, '//*[@class="tagline"]'), function(node) {
    node.innerHTML += ': ' + time + '(' + count + ' programs)';
  });
})(this.document, [].forEach);