Quick Tips/Tooltips [closed]

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I'm looking to implement some tooltips that will show quick tips to users on a web app. They will need to shown only once and can be turned off from a users preferences.

Anyone developed anything like this before? Looking for some ideas/suggestions for how to implement such functionality...

Flow has a good implementation of them as does Facebook:

Just to clarify I'm not asking how to create ToolTips using jQuery or other frameworks rather I am asking how to show tooltips based on user interaction when they first view an app and then no longer see them and can also disable them from a user preference in personal settings

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jQuery tools has a good implementation. It's light too.

http://flowplayer.org/tools/tooltip/index.html