/* Social Media Tracking */

twttr.events.bind('tweet', function(event) {
  if (event) {
    var targetUrl;
    if (event.target && event.target.nodeName == 'IFRAME') {
      targetUrl = extractParamFromUri(event.target.src, 'url');
    }
    _gaq.push(['_trackSocial', 'twitter', 'tweet', targetUrl]);
  }
});


function extractParamFromUri(uri, paramName) {
  if (!uri) {
    return;
  }
  var uri = uri.split('#')[0];  // Remove anchor.
  var parts = uri.split('?');  // Check for query params.
  if (parts.length == 1) {
    return;
  }
  var query = decodeURI(parts[1]);

  // Find url param.
  paramName += '=';
  var params = query.split('&');
  for (var i = 0, param; param = params[i]; ++i) {
    if (param.indexOf(paramName) === 0) {
      return unescape(param.split('=')[1]);
    }
  }
}