capturing basic authentication details

Hello I have created an application exchanging messages between a client and server that allows the user to use http basic or digest authentication. Im trying to show in my work that using some kind of network analyser eg: ethereal, you can see the password-username pair in basic authentication being passed in plain text. Thing is, i cant get ethereal to pick this up, i just cant see the packet passing through my network even though the application functions correctly...so it must be somewhere! Any thoughts? Anyone have an example of what a packet would look like with the captured username-password pair in them? Cheers Laura