How to use Slide Show Extender on prerender event.

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ASP.NET

Hi Sir,
I am using SlideShow extender by previous and next button click.the code is like this

<form id="form1" runat="server">
    <br />
    <div>
        <cc1:ToolKitScriptManager ID="ScriptManager1" runat="server">
        </cc1:ToolKitScriptManager>
        <asp:Image runat="server" ID="image1" Height="100" />
        <asp:Button runat="Server" ID="prevButton1" Text="Previous" />
        <asp:Button runat="Server" ID="nextButton1" Text="Next" />
        <cc1:SlideShowExtender runat="Server" ID="slideShowExtender1"   
                TargetControlID="image1" NextButtonID="nextButton1"  
                PreviousButtonID="prevButton1" SlideShowServiceMethod="GetSlides" 
                Loop="true" onprerender="slideShowExtender1_PreRender"/>
    </div><br />
    <div>
        <asp:Image runat="server" ID="image2" Height="150" />
        <asp:Button runat="Server" ID="prevButton2" Text="Previous" />
        <asp:Button runat="Server" ID="nextButton2" Text="Next" />
        <cc1:SlideShowExtender runat="Server" ID="slideShowExtender2" 
                TargetControlID="image2" NextButtonID="nextButton2" 
                PreviousButtonID="prevButton2" SlideShowServiceMethod="GetSlidesWithContext"  
                BehaviorID="SlideShow" ContextKey="Context..." />
   </div>
</form>

and on Defaul.aspx.cs

[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public static AjaxControlToolkit.Slide[] GetSlides()
{
   AjaxControlToolkit.Slide[] imgSlide = new AjaxControlToolkit.Slide[3];
   imgSlide[0] = new AjaxControlToolkit.Slide("images/0.jpg", "Autumn", "Autumn Leaves");
   imgSlide[1] = new AjaxControlToolkit.Slide("images/039.jpg", "Creek", "Creek");
   imgSlide[2] = new AjaxControlToolkit.Slide("images/33917_173677092645736_173560562657389_657877_5955296_n.jpg", "Landscape", "Landscape");
   return (imgSlide);
}

now i want that this slideshow work automatically without using button click as page load.
Thanks.