Ajax and MVC

Hi, I am a beginner to Ajax and MVC, and am trying to figure out how to get a particular thing to work

Basically, I have a method that gets all directories/subdirectories from a given root directory, and what I want to do is clicking on a directory to have it populate a span/div directly below it with all the files within that directory

I'll show you what I've got right now, and hopefully you'll be able to tell me what I'm missing/doing wrong.  Thanks a lot for your time

Controller:

public PartialViewResult GetFiles(string path)
        {
            ImageFileModel[] files = OriginationViewerModelBuilder.GetImageFiles(path);
            return PartialView(files);
        }

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View:

@helper ShowDirectoryTree(ImageDirectoryModel imageDirectory)
{
    <ul>
        <li>
            <b>@Ajax.ActionLink(imageDirectory.Path,"GetFiles",new {path = imageDirectory.Path},new AjaxOptions{UpdateTargetId=imageDirectory.FileSpanID})</b>
            <span id="@imageDirectory.FileSpanID"></span>
        </li>
        
        @if (imageDirectory.ImageSubDirectories.Any())
        {
            foreach (var sub in imageDirectory.ImageSubDirectories)
            {
                @ShowDirectoryTree(sub);
            }
        }

    </ul>
}


@Model.Title

Image Folder: @Model.Configuration.Options.OriginalImagesFolder
<br />
@foreach (var directory in Model.ImageDirectories)
{
    @ShowDirectoryTree(directory);
}

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Partial View GetFiles:

@model IEnumerable<ImageFileModel>

<ul>
    @foreach (var file in Model.ToArray())
    {
        <li>@file.Filename</li>
    }
</ul>

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Now I think I'm just missing some javascript, or am mis-using the Ajax Action link, as currently clicking on the link will just open up the partial view as a new page, but not quite sure how to pull it all together