docs: function scanDocuments(docs, id) {
              var i, len;
              len = docs.length;
              if (len === 1) {
                  return !docs[0].document.getElementById(id);
              }
              if (len === 2) {
                  return !!(docs[0].document.getElementById(id) &&
                            docs[1].document.getElementById(id));
              }
              i = -1;
              for ( ; ++i < len ; ) {
                  if (docs[i].document.getElementById(id)) return false;
              }
              return true;
          }