Forms Data Controls :: Microsoft JScript Runtime Error: Object Expected After Click On Any Cells Of Grid View

I am using the following to retrieve selected value of a gridview

protected void gvDetail_RowDataBound(object sender, GridViewRowEventArgs e)
{
gvDetail.DataKeyNames = new string[] { "ID Number" };
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes["onmouseover"] = "this.style.cursor='hand';this.style.textDecoration='underline';";
e.Row.Attributes["onmouseout"] = "this.style.textDecoration='none';";
e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(this.gvIncidentDetail, "Select$" + e.Row.RowIndex);
}
}

The first time I click on any cells, it runs good, the second time i click on any cells of grid view, it prompts an error:

Microsoft JScript runtime error: Object expected