template/html/jquery-tablesorter.js
function( table, $tb, getIt ) {
         table = $( table )[ 0 ];
         if ( getIt ) {
            table.isProcessing = true;
            $tb.before( '<colgroup class="tablesorter-savemyplace"/>' );
            return $.fn.detach ? $tb.detach() : $tb.remove();
         }
         var holdr = $( table ).find( 'colgroup.tablesorter-savemyplace' );
         $tb.insertAfter( holdr );
         holdr.remove();
         table.isProcessing = false;
      }
function( table, $tb, getIt ) {
         table = $( table )[ 0 ];
         if ( getIt ) {
            table.isProcessing = true;
            $tb.before( '<colgroup class="tablesorter-savemyplace"/>' );
            return $.fn.detach ? $tb.detach() : $tb.remove();
         }
         var holdr = $( table ).find( 'colgroup.tablesorter-savemyplace' );
         $tb.insertAfter( holdr );
         holdr.remove();
         table.isProcessing = false;
      }
detach tbody but save the position don't use tbody because there are portions that look for a tbody index (updateCell)