Using GXmlHttp and Webservices
I'm trying to use GXmlHttp in the Google Maps API to call a Webservice of mine (myService.asmx?op=myMethod) and am not having luck.  Is there a way to call this web method using this object?  Some sample code:

var request = GXmlHttp.create();
request.open("POST", "http://myDomain/MyServicee.asmx?op=MyMethod", true);

Nothing comes back.  IT gets to readystate 4 but the method is never called.  Any help is greatly appreciated!
Using GXmlHttp and Webservices
===

I'm trying to use GXmlHttp in the Google Maps API to call a Webservice of mine (myService.asmx?op=myMethod) and am not having luck.  Is there a way to call this web method using this object?  Some sample code:

var request = GXmlHttp.create();
request.open("POST", "http://myDomain/MyServicee.asmx?op=MyMethod", true);

Nothing comes back.  IT gets to readystate 4 but the method is never called.  Any help is greatly appreciated!