固定DataGrid的标题

样式：

1.FixGridHeaderAbove
2{}{
3    text-align: center;
4    font-weight:bold;
5    background-color:#C0C0FF;
6    POSITION: relative; 
7    TOP: expression(this.offsetParent.scrollTop) ;
8} 

代码：

1<div style="OVERFLOW: auto; HEIGHT: 380px; WIDTH: 500;" align="center">
2                            <asp:DataGrid id="DataGrid1" runat="server">
3                                <HeaderStyle CssClass="FixGridHeaderAbove"></HeaderStyle>
4                            </asp:DataGrid>
5                        </div>