I need your help: creating popup for taking notes

Hi all,

Hope you can help me out.
What I need:

A link, if you click it there will be a (lightbox) popup. In this popup is just a field to put text in. This text is saved in cookies, or if possible in the database.

So each user has a unique popup with their notes in.

Can this be done? Hope you can help me.

Many thanks!