add OpenLayers.Popup and a directory Popup, in which we will put all custom popups.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@220 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Popup.js

@@ -0,0 +1,20 @@
+/**
+* @class
+*/
+OpenLayers.Popup = Class.create();
+OpenLayers.Popup.prototype = {
+
+    
+
+    /** 
+    * @constructor
+    */
+    initialize:function() {
+    
+    },
+    
+    
+    
+    
+    CLASS_NAME: "OpenLayers.Popup"
+};