title: How to position a pop up div like the profile info on this site
body: <p>I'm trying to do a pop up div like the ones that show up when you hover over your username or click the StackExchange words on the top most tool bar on this site.</p>
  
  <p>I'm not asking for the ajax code etc. Just how to position it. I looked at their code using firebug, but they don't specify a position like x 250 y 500. So how do these guys get it to appear just under the username or StackExchange letters?</p>