Highlight selected row when onclick javascript

C#

    e.Row.Attributes.Add("onclick", "onGridViewRowClick(this);");   

Javascript:

       // highlight selected row javascript

        function onGridViewRowClick(row) {

            var table = document.getElementById("grid");

            for (var i = 1; i < table.rows.length - 1; i++) {

                if (i % 2 != 1) {

                    table.rows[i].className = 'gvRowStyle';

                }

                else {

                    table.rows[i].className = 'gvAlternatingRowStyle';

                }

            }
           // highlight selected row

            row.className = 'gvonclickstyle';

        }