Some kind of Popup

I have web pages that display multiple physical products. I'd like to be able to include a button near each one to display certain characteristics (eg: height, length, depth, weight etc). These characteristics will be in a single table record in Mysql for each product, so I can retrieve the record for that product. The question is, how to display them. I'd like a small display window to appear in front of the web page. If possible, I'd like the user to be able to move it or request the specs for another product, and then have both displayed. I realize that can get messy, and is not absolutely necessary. I have considered locating an invisible display box near each product, but I think some kind of floating window would be better. The web page uses CSS. Any ideas on how to proceed?