Can't get simple SOAP Web service javascript client to work

I have a simple demo web service (helloWorld) written in Delphi 7

the invokable call implemented on the server side looks like this:

function helloWorld: String;stdcall;
begin
 result:= "Hello World";
end;

you can find it here

http://72.45.130.90/cgi-bin/test1.exe

WSDL here:

http://72.45.130.90/cgi-bin/test1.exe/wsdl/IDemo1


I have written a client in delphi and called the service and it works great.

I am trying to write a Web browser client in Javascript to test it, but can't seem to get it to work.

I am using the soapclient.js from :

http://javascriptsoapclient.codeplex.com/

and the hellow orld example from here:

http://www.guru4.net/articoli/javascript-soap-client/demo/en.aspx

I have included my HTML doc below.

can anyone please tell me why i keep getting a NULL returned instead of "Hello World"??????

thankx!
<html>
<head>
<script type="text/javascript" src=""http://72.45.130.90/scripts/soapclient.js""></script>
<script type="text/javascript">
function HelloWorld()
{
 var pl = new SOAPClientParameters();
 SOAPClient.invoke( "http://72.45.130.90/cgi-bin/test1.exe/wsdl/IDemo1", "helloWorld", pl, 
true, HelloWorld_callBack);
}

function HelloWorld_callBack(r)
{
 alert(r);
} 

</SCRIPT>
</head>
<body>
<FORM NAME="myform" ACTION="" METHOD="GET"><P>
<INPUT TYPE="button" NAME="button" Value="Click" onClick="HelloWorld()">
</FORM>
</body>
</html>

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