Demonstration of the JavaScript module "pattern"

lib1.js

(function(global) {
function something() {
  alert('something from lib1');
}
global.something = something;
})(window.lib1 = {});

lib2.js

(function(global) {
function something() {
  alert('something from lib2');
}
global.something = something;
})(window.lib2 = {});