Really simple lightbox. You can open lightbox with given dimensions and html. 
 
It's build to be fast and really light - all positioning is based on CSS (with some expressions hacks for IE6 and IE7).
 
Usage:
Initialize lightbox and give custom paths to images and stylesheets:
 
$.lightBoxFu.initialize({imagesPath: '/images/', stylesheetsPath: '/stylesheets/'});
 
Open lightbox with given html and width:
 
$.lightBoxFu.open({
        html: "Some <b>shiny</b> HTML.",
        width: "250px",
        /* don't let the user close lightBoxFu by clicking on an overlay */
	closeOnClick: false
      });
 
Based on overlay by Riddle (riddle.pl):
http://perfectionorvanity.com/2007/04/08/polprzezroczyste-warstwy-overlay-i-okienka-div/
http://riddle.pl/-/xhtml/css-overlay/overlay-fixed-final.html