Syntax error in HTML code and runtime error stating function is undefined

I'm trying to get a handle on ASP.NET web page coding in VisualStudio2008 (yep, I'm behind the times). I used an MS Walk Through in MSDN titled "Walkthrough: Creating and Using AJAX-enabled ASP.NET Service". When running the resulting web page, I kept getting an error "JavaScript runtime error:'OnClickGreetings' is undefined". Finally, I gave up on that and found another, video based, tutorial titled "Creating and Using an AJAX-enabled Web Service in a Web Site". I entered all of the code presented in that tutorial, but have at least 2 problems that I can't resolve. Firstly, in VS, in the web page where I've embedded JavaScript, as instructed on the video, I have a small squiggly under the </script> closing tag. When I hover over it, the tooltip says "Expecting more source characters". I cannot for the life of me see what I' missing in the code between the <script> and </script> tags (I'm new to JavaScript, as well).

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head id="Head1" runat="server"><style type="text/css">
            body { font: 11pt Trebuchet MS;
                   color: #000000;
                   padding-top: 72px;
                   text-align: center; }
            .text { font: 8pt Trebuchet MD }</style><title>Simple Web Service</title><script type="text/javascript">

    function OnGreetingsClick()
    {
        Samples.Aspnet.HelloWorld.Greetings(
            $get("NameTextBox").value,
            OnGreetingsComplete);
    {

    function OnGreetingsComplete(result)
    {
        var elem = $get("Results");
        elem.innerHTML = result;
    }</script></head><body><form id="form1" runat="server"><div><asp:ScriptManager runat="server"><Services><asp:ServiceReference Path="http://localhost/WT_HelloWorldWebService/HelloWorld.asmx" /></Services></asp:ScriptManager><h2>Simple Web Service Client</h2><p>Calling a simple service that shows a greeting
     and the server date and time</p><table><tr><td>Name:</td><td><input type="text"
                id="NameTextBox" /></td></tr><tr><td>&nbsp;</td><td><button id="GreetingsButton"
                onclick="OnGreetingsClick()">Greetings</button></td></tr></table></div><hr /><div><span id="Results"></span></div></form></body></html>

Secondly, if I ignore the VS error, and try and run the page, it renders fine, but when I try to test the javascript function behind the Greetings button, I get an error similar to the one I got with the initial MS Walk Through, which is "Error: 'OnGreetingsClick' is undefined. I'm hoping that this error may be a result of the syntax error, but I sure don't know what the syntax error is telling me. Thanks for any light you can shed on this.

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