how to pass parametre to my SlideShowServiceMethod

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C#

ASP.NET

Ajax-toolkit

hi,
i want to pass parametre to my methode ( the paramtre is the path off my directory off picture)
this's my code

<asp:Image ID="Image1" runat="server" Height="300" Width="300" />
           <cc1:SlideShowExtender ID="SlideShowExtender" runat="server" TargetControlID="Image1"
               SlideShowServiceMethod="GetImages" ImageTitleLabelID="lblImageTitle" ImageDescriptionLabelID="lblImageDescription"
               AutoPlay="true" Loop="true" PlayButtonID="btnPlay" StopButtonText="Stop"
               PlayButtonText="Play" NextButtonID="btnNext" PreviousButtonID="btnPrevious">
           </cc1:SlideShowExtender>

[WebMethod]
[ScriptMethod]
public static Slide[] GetImages()
{
    List<slide> slides = new List<slide>();
    string path = HttpContext.Current.Server.MapPath("~/images/");
    if (path.EndsWith("\\"))
    {
        path = path.Remove(path.Length - 1);
    }
    Uri pathUri = new Uri(path, UriKind.Absolute);
    string[] files = Directory.GetFiles(path);
    foreach (string file in files)
    {
        Uri filePathUri = new Uri(file, UriKind.Absolute);
        slides.Add(new Slide
        {
            ImagePath = pathUri.MakeRelativeUri(filePathUri).ToString()
        });
    }
    return slides.ToArray();
}

i want to pass paramtre to my function GetImages
by the way this code i have download it
and thanks