A simple web service post

<mx:HTTPService id="userRequest" url="../targetFileOnWebServer.aspx" useProxy="false" method="POST" fault="Alert.show('Oops: There has been an a problem with the connection.\nPlease check your internet connnection and try again.','Connection Error')" result="HandleLogin();" showBusyCursor="true"  >
            <mx:request xmlns="">
                <JsonParameter>{MyStringWithThePrameter}</JsonParameter>
            </mx:request>
        </mx:HTTPService>