How do I upgrade Debian from etch to lenny?

How do I upgrade Debian from etch to lenny? I have an old machine running Debian etch that I want to upgrade to lenny without reinstalling. How can I do this?
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bert [Entry]

"The Debian project release fairly detailed upgrade instructions as part of the release notes for each release.

See http://www.debiandotorg/releases/stable/releasenotes. Section 4 is what you are looking for. http://www.debiandotorg/releases/stable/i386/release-notes/ch-upgrading.en.html is the HTML-section-per-page version of i386 (use the previousl link to find the right version if you use a different architecture)."