template/html/jquery-tablesorter.js
function( $table, toggle, $headers ) {
         $table = $( $table );
         var c = $table[ 0 ].config,
         // default to all headers
          $header = $headers || $table.find( '.' + ts.css.header );
         if ( toggle ) {
            // don't use sortList if custom $headers used
            if ( typeof $headers !== 'undefined' && c.sortList.length > 0 ) {
               // get headers from the sortList
               $header = $header.filter( function() {
                  // get data-column from attr to keep compatibility with jQuery 1.2.6
                  return this.sortDisabled ?
                   false :
                  ts.isValueInArray( parseFloat( $( this ).attr( 'data-column' ) ), c.sortList ) >= 0;
               });
            }
            $table.add( $header ).addClass( ts.css.processing + ' ' + c.cssProcessing );
         } else {
            $table.add( $header ).removeClass( ts.css.processing + ' ' + c.cssProcessing );
         }
      }
function( $table, toggle, $headers ) {
         $table = $( $table );
         var c = $table[ 0 ].config,
         // default to all headers
          $header = $headers || $table.find( '.' + ts.css.header );
         if ( toggle ) {
            // don't use sortList if custom $headers used
            if ( typeof $headers !== 'undefined' && c.sortList.length > 0 ) {
               // get headers from the sortList
               $header = $header.filter( function() {
                  // get data-column from attr to keep compatibility with jQuery 1.2.6
                  return this.sortDisabled ?
                   false :
                  ts.isValueInArray( parseFloat( $( this ).attr( 'data-column' ) ), c.sortList ) >= 0;
               });
            }
            $table.add( $header ).addClass( ts.css.processing + ' ' + c.cssProcessing );
         } else {
            $table.add( $header ).removeClass( ts.css.processing + ' ' + c.cssProcessing );
         }
      }
*** Process table *** add processing indicator