<DIV style="BACKGROUND-POSITION: center center; BACKGROUND-ATTACHMENT: fixed; BACKGROUND-IMAGE: url(image/Background.jpg); BACKGROUND-REPEAT: no-repeat">
<FONT face="宋体" id="FONT1" runat="server">
<asp:textbox id="TextBox1" style="Z-INDEX: 101; LEFT: 272px; POSITION: absolute; TOP: 152px" runat="server"></asp:textbox>
<asp:button id="ButtonLogin" style="Z-INDEX: 102; LEFT: 272px; POSITION: absolute; TOP: 248px" runat="server" Text="Login"></asp:button>
</FONT>
</DIV>
<FONT face="宋体" id="FONT1" runat="server">
<asp:textbox id="TextBox1" style="Z-INDEX: 101; LEFT: 272px; POSITION: absolute; TOP: 152px" runat="server"></asp:textbox>
<asp:button id="ButtonLogin" style="Z-INDEX: 102; LEFT: 272px; POSITION: absolute; TOP: 248px" runat="server" Text="Login"></asp:button>
</FONT>
</DIV>
backgroud值设置好就行