Thread:Project:Support desk/Dialog boxes

I would like to add a few links to MW:Sitenotice that can popup a dialog menu. A little like this:

http://www.queness.com/post/77/simple-jquery-modal-window-tutorial (or http://www.queness.com/post/1696/create-a-beautiful-looking-custom-dialog-box-with-jquery-and-css3 )

except that the menu should be able to handle wiki syntax, with some clickable links for site navigation and a few search boxes. I suppose you can copy the CSS and Javascript code to the appropriate MW pages, but what about the wiki equivalent of the HTML used there? What should it look like? Or are there better alternatives to consider?