how change the image in adrotator
i want every twenty second change the image in adrotator
i used scriptmanager and timer controlUpdatePanel,Triggers,ContentTemplate,AdRotator then add advertisement file :add of xml file .this controls change the image every seconds .please help me
my code behind sourse is given below
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
</div>
<asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Interval="1000">
</asp:Timer>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:AdRotator ID="AdRotator1" runat="server" style="z-index: 103; left: 450px; position: absolute; top: 57px" />
<asp:TextBox ID="TextBox1" runat="server" style="z-index: 100; left: 283px; position: absolute; top: 143px"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</form>