GetPersistentObject()
A unique persistent copy of this object.
The first time this function is called for any particular object a new script object is created as if the script "new Object" had been used. Subsequent calls to the function will return the same object. By setting properties of the object returned information can be stored that will remain even while the page is not visible. This mechanism is required because the objects on the page are destroyed when the page is no longer visible and are recreated when it becomes visible again.