jqGrid 3.8 - keeping track of checkboxes across pages

$(this.grid).jqGrid({
    gridComplete: $.proxy(this._onPageLoaded, this),
    onSelectAll: $.proxy(this._onSelectAllPress, this),
    onSelectRow: $.proxy(this._onSelectRow, this)
});


    /**
     * Handles clicks to the check-all box
     */
    _onSelectAllPress: function (ids, status) {
        // 10/05/2010: Bug in jqGrid 3.8.1: undefined item added to front of ids when selecting all, and "" added
        //             to front of ids when removing all selections
        if (typeof(ids[0]) === "undefined" || typeof(ids[0]) === "") {
            ids.shift();
        }

        if (status) {
            this._addIdsToSelectedCache(ids);
        } else {
            this._removeIdsFromSelectedCache(ids);
        }
    },

    /**
     * Handles single record selections
     */
    _onSelectRow: function (id, selected) {
        var row = $(this.grid).jqGrid("getRowData", id);

        if (selected) {
            this._addRowToSelectedCache(id, row['provider'], row['fileid']);
        } else {
            this._removeRowFromSelectedCache(id);
        }
    },

    /**
     * Performs some actions when a page from the grid results is displayed
     *
     * NOTE 10/15/2010: Also triggered during sorting and filtering, but data = undefined!
     */
    _onPageLoaded: function () {
        var grid, page, hires, content, shadow, self = this;

        grid = $(this.grid);
        page = grid.jqGrid('getGridParam', 'page');

        // If this is first time on page, cache and exit
        if ($.inArray(page, this._pagesViewed) === -1) {
            this._pagesViewed.push(page);
            return;
        }

        // Otherwise check to see if any checkboxes on the current page have previously been checked
        $.each(grid.jqGrid("getDataIDs"), function (i, id) {
            if (self._selected[id]) {
                $("#" + id + " .cbox").attr("checked", "checked");
            }
        });
    },