Deploy new code

Env:
Win2003, Oracle 9i, OFS(oracle fail safe). Application Server - MS IIS

I am looking for a new approach/method that will eliminate (if possible) the down time that the application currently needs to endure during the deploy window.
When a new version of the code needs to be deployed, the web servers are stopped , code is deployed and to both DB and web servers, than Web servers are brought back up.

What I want to achieve is to be able to have all this done while the application continues to work.

TIA.
Yuval

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