template/html/jquery-tablesorter.js
function( c, callback ) {
         c.table.isUpdating = true;
         ts.buildHeaders( c );
         ts.bindEvents( c.table, c.$headers, true );
         ts.resortComplete( c, callback );
      }
function( c, callback ) {
         c.table.isUpdating = true;
         ts.buildHeaders( c );
         ts.bindEvents( c.table, c.$headers, true );
         ts.resortComplete( c, callback );
      }
simple header update - see #989