code: function validateVideoIds(monitorVideoId, videoIds) {
              var i;
              // verify that video ids were not typos.
              if (monitorVideoId && !document.getElementById(monitorVideoId)) {
                  easyrtc.showError(easyrtc.errCodes.DEVELOPER_ERR, "The monitor video id passed to easyApp was bad, saw " + monitorVideoId);
                  return false;
              }
      
              for (i in videoIds) {
                  if (!videoIds.hasOwnProperty(i)) {
                      continue;
                  }
                  var name = videoIds[i];
                  if (!document.getElementById(name)) {
                      easyrtc.showError(easyrtc.errCodes.DEVELOPER_ERR, "The caller video id '" + name + "' passed to easyApp was bad.");
                      return false;
                  }
              }
              return true;
          }
docs: Validates that the video ids correspond to dom objects.
  @param {String} monitorVideoId
  @param {Array} videoIds
  @returns {Boolean}
  @private