I am sure all of you have observed the cohesive design of this site. My question is about some of the cool info-boxes...that appear on various events. Like when someone with lower reputation tries to down-vote OR the long box that appears just below the browser address bar when I have got response to one of my questions.
These are basically JS generated DIV elements...but do any one of you know a good library/ set of controls that can be used to achieve these styling effects?