In my experience, requirements change quite often, or new situations will arise that werent anticipated at the start of the project. If the situation can be addressed with a plugin, I just whip open the standalone plugin page, make the updates and pop the new plugin back in. Because the plugin is self-contained, its easy to recreate the problem, fix it, and get it back into the codebase.
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About Robert Duchnik, jQuery Plugin Development In 30 Minutes
Robert Duchnik, jQuery Plugin Development In 30 Minutes.