CSS简单问题，如何单独定义GridView表头超链接样式
怎么单独的定义表头的 A 标记样式。我单独定义了HeaderStyle 都会被全局的 A:link 覆盖，而全局的A:link 又不想改它。
<%@ Register Assembly="AspNetPager" Namespace="Wuqi.Webdiyer" TagPrefix="webdiyer" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>无标题页</title> <style type="text/css" media="screen">html,body { font-family: Verdana, Arial, @宋体; FONT-SIZE: 13px; MARGIN: 0; color: #333333; }table {border-collapse:collapse; /* 关键属性：合并表格内外边框(其实表格边框有2px，外面1px，里面还有1px哦) */border:solid #999; /* 设置边框属性；样式(solid=实线)、颜色(#999=灰) */border-width:1px 0 0 1px; /* 设置边框状粗细：上 右 下 左 = 对应：1px 0 0 1px */}table caption {font-size:14px;font-weight:bolder;}table th,table td {border:solid #999;border-width:0 1px 1px 0;padding:2px; height:25px;}tfoot td {text-align:center;}A:link { COLOR: #004080; TEXT-DECORATION: none; /* 表示未被访问时 */}A:visited { COLOR:#004080; TEXT-DECORATION: none; /* 访问后 */}A:hover { COLOR: #004080; TEXT-DECORATION: underline; /* 指针指在 */}A:active { COLOR: #004080; TEXT-DECORATION: none; /* 鼠标点击时 */ }.GridHeader{ background-color:#d8d8d8; font-weight:bold; }</style> </head><body> <form id="form1" runat="server"> <div align="center"> <div style="width:800px;"> <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False" AllowSorting="True" OnSorting="GridView1_Sorting" OnRowCreated="GridView1_RowCreated" Width="100%" DataKeyNames="ProductID" OnRowDataBound="GRidView1_RowDataBound"> <HeaderStyle CssClass="GridHeader" /> <Columns> <asp:BoundField DataField="ProductID" HeaderText="ProductID" SortExpression="ProductID" /> <asp:BoundField DataField="SupplierID" HeaderText="SupplierID" SortExpression="SupplierID" /> <asp:TemplateField HeaderText="ProductName" SortExpression="ProductName"> <ItemTemplate> <%#Eval("ProductName")%> </ItemTemplate> <HeaderStyle CssClass="a1" /> <ItemStyle HorizontalAlign="Left" /> </asp:TemplateField> </Columns> <pagersettings Visible="False" /> </asp:GridView> </div> </div> </form> </body></html>