传值打开固定大小页面


<asp:GridView ID="GridView1" runat="server" Width="100%" AutoGenerateColumns="False" Height="95px" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
                    <Columns>
                        <asp:BoundField DataField="ADSite" HeaderText="网站名称" />       
                        <asp:TemplateField HeaderText="网站地址">
                            <ItemTemplate>
                                <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%#"Default6.aspx?mysite="+Eval("ADSiteName")%>' Target="_blank" DataTextField='<%#Eval("ADSiteName")%>' Text='<%#Eval("ADSiteName")%>' ></asp:HyperLink>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                    <HeaderStyle HorizontalAlign="Left"/>
                </asp:GridView>
如何在NavigateUrl='<%#"Default6.aspx?mysite="+Eval("ADSiteName")%>'这里设置打开固定大小的Default6页面呢？
例如150*150的页面？
谢谢