[mod_python] dumb question

As newbie to mod_python I believe  I am missing something rather fundemental 
about the way in which it works. I've a script with handler function which 
has a number conditional statements, which depending upon user input return 
different output, i.e successful login, unsuccessful login, home page. The 
thing that is really puzzling me is that a user will login successfully, 
both the initial screen 'enter login details' is still displayed and 
together with the new screen, which appears to be appended onto the initial 
screen. It doesn't appear to conditional logic error, it's almost as if the 
latest output is being appended to the former input and the whole lot is 
being sent rather than just the required output. Any ideas ?

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