How can you add an overlay advertisement to an html website?

I have a basic html website, and it has a few flash pieces. I want to promote a new CD in way that the website darkens, and the CD advertisement appears in the center of the screen (not as a pop-up, but within the current window).



I know that this can be done, but I just dont know how. I would prefer if I could do it via CSS or PHP, but I'm sure Javascript will probably be the solution.



Thanks for the help!How can you add an overlay advertisement to an html website?
Try using Lightbox:



http://en.wikipedia.org/wiki/Lightbox_(J



http://www.lightbox.com/



RonHow can you add an overlay advertisement to an html website?
You may like to take an html tutorial at

http://referencedesigner.com/tutorials/html/html_1.php