Issue 5: Incorrect usage on Project Home page
Status:  New
Owner: ----
Reported by oxyge...@gmail.com, Oct 19, 2011
//On http://kammerer.boo.pl/code/prototype-overlay/:

var overlay = new Overlay().show(element);
//now contains "undefined", as show doesn't return anything (tested on Google Chrome).
overlay.hide();//error

//A correct example would be:
var overlay = new Overlay();
overlay.show();

overlay.hide();//works