Client side javascript print statements don't appear for XPages in Notes Client. Server-side javascript print statements get logged to the support trace (Help-Support-View Trace).
Is your client-side javascript specific to the Notes Client? For debugging, unless you're looking at specific Notes Client behaviour, I'd recommend debugging with something like Firefox and Firebug.
If you want to look at the source code, you can use View Page source button (this only appears if you have Designer installed)