Our clients have a requirement where they want to see an icon next to each file uploaded that shows the file type (pdf, word, etc).  I am trying to use the file.getElementById function on the OnClientFileAdded method. 

Here is a portion of the "AddFile" method:

    function <%= ClientID %>_addFile(file) {

        //get the file selector
        var fileUpload = kw.get('<%= fsSelector1.ClientID %>');
        var files = fileUpload.get_Files();
       
        //set the extension image
        var imgExt = file.getElementById("imgFileExt");
       
        var strFileExt = file.extension;
        if (strFileExt.toLowerCase() == "docx")
        {
            strFileExt = "doc";
        }
        if (strFileExt.toLowerCase() == "pps")
        {
            strFileExt = "ppt";
        }
        if (strFileExt.toLowerCase() == "xlsx")
        {
            strFileExt = "xls";
        }
        var strImg;
        switch (strFileExt.toLowerCase())
        {
            case "doc": case "dwf": case "dwg": case "jpg": case "pdf": case "ppt": case "rvt": case "tif": case "xls": case "zip":
                strImg = "/images/button_" + strFileExt + ".gif";
                break;
            case "pptx": case "pptm":
                strImg = "/images/button_ppt.gif";
                break;
            default:
                strImg = "/images/button_unknowntype.gif";
                break;
        }
        imgExt.src = strImg;

.....

Here is the fileList code:

        <kw:FileList ID="fl" runat="server">
            <FileTemplate>
                <kw:FileListRemoveLink ID="FileListRemoveLink1" runat="server" Title="Remove">
                    <img src="/images/close.gif" border="0" />
                </kw:FileListRemoveLink>
                &nbsp;&nbsp;&nbsp;<kw:FileListFileName ID="FileListFileName1" runat="server" />
                &nbsp;&nbsp;&nbsp;<img id="imgFileExt" />
                <kw:FileListValidationMessage ID="FileListValidationMessage1" runat="server" ForeColor="Red" />
            </FileTemplate>
        </kw:FileList>

When I add a file, it gives me a "imgExt is null"error.

This is our last hurdle for this new release.  Thanks for such a great product!

Can you email your .aspx and codebehind to chrish at krystalware dot com? We've tested several configurations based on the snippet you sent and we haven't been able to reproduce the issue.