You can always choose a Content Management System to implement that for you, but if you're site is already up, it might be a little too much.
After researching into Joomla for a while I decided to do that with Adobe Dreamweaver Developer Toolbox, a great product that allows you to implement all those things with tools and widzards.
It required a lot more knowledge than implementing a CMS, but it allows you to choose only what you need and implement it on an already done site.
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