Frank,
Please try the following code:
<%@ Page Language="C#" %>
<html>
<head>
</head>
<body>
<form id="form1" runat="server">
<CuteWebUI:Uploader ID="uploader1" runat="server"></CuteWebUI:Uploader>
<script>
function CuteWebUI_AjaxUploader_OnStart()
{
var hidden=this;
hidden.internalobject.insertBtn.style.display="none";
hidden.internalobject.cancelBtn.style.visibility="hidden";
}
</script>
</form>
</body>
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