// create shortcuts for YAHOO namespace, allows for easier coding/readability.
if(YAHOO.util){
  var yuiDom = YAHOO.util.Dom;
  var yuiEvent = YAHOO.util.Event;
  var yuiAnim = YAHOO.util.Anim;
  var yuiConnect = YAHOO.util.Connect;
}
// create base namespace
var sw = YAHOO.namespace("sw");

// to extend the base sw object, use YAHOO.namespace("sw.MyNamespace");
// YAHOO.namespace("sw.Event"); - you can now attach objects and method to sw.Event