More JSDoc and cleanup.

guacamole-common-js/src/main/resources/oskeyboard.js

@@ -20,6 +20,14 @@
 // Guacamole namespace
 var Guacamole = Guacamole || {};
 
+/**
+ * Dynamic on-screen keyboard. Given the URL to an XML keyboard layout file,
+ * this object will download and use the XML to construct a clickable on-screen
+ * keyboard with its own key events.
+ * 
+ * @constructor
+ * @param {String} url The URL of an XML keyboard layout file.
+ */
 Guacamole.OnScreenKeyboard = function(url) {
 
     var allKeys = new Array();