Align Plugin, buttons in write post

Hi there, i was wondering if there is a plugin (or if someone could make a plugin) that added ‘aign left’ ‘align center’ ‘align right’ buttons to the tool bar, when i write my posts?

I can easily use div tags ( align=”center”) but this is a hassel doing it all the time, and also not all the contributors to my blog know basic html.

Is there anyway someone could make a plug in to wrap the tags <div align=”___”> </div> around something, much the same way the other format tags work?

Thankyou for your feedback.