getting busy signal, 603 error

I'm trying to run a script, hosted on Tropo, that will say a random word to the user when they call the app.  My script is:

function httpGet(theUrl)
var xmlHttp = new XMLHttpRequest();
xmlHttp.open( "GET", theUrl, false ); // false for synchronous request
xmlHttp.send( null );
return xmlHttp.responseText;
var word=httpGet("http://randomword.setgetgo.com/get.php");
say("Null word is null.");
say("The word is "+word);

When I call, I get a busy signal.  The log shows the following:


The script works correctly on JSFiddle (substituting alert() for say()).  Is there something different I should do for performing GET requests on Tropo?

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