After remove of rows you must rebuild the table rows.
Example of coding:

    /*
     * Restructure la table rows aprs suppression des lignes T BRETAGNE Oct 2003
     */

    this.restructRows = function() {
       var rows2 = new Array();
       var j = 0;
       for (var i = 0; i < this.rows.length; i++) {
            row = this.rows[i]; if (row != null) { rows2[j] = row;  j++;}
        }
        this.rows = rows2;
    }

Thank you for your tools.