Insert text in textarea

Hey guys,

I have a question about sending text to a textarea. What I want is, if I click on a button, a text has to be sent to my textarea, which I obtain from my mysql database. This last thing I can do myself, but I do not know how to send the text to my textarea.

I don't know nothing from AJAX yet, so I think it can be done with AJAX, but also with javascript I guess. Could someone point me in the right direction?

Thanks!

This might be a good place to start:

http://www.alistapart.com/articles/gettingstartedwithajax/