SessionTag -
Attributes:
id
restore attribute from session to page context
name
save attribute from page context to session
attribute
name of session attribute to operate on
author: Robert O'Brien version: 1.0
If 'name' attribute then save from page to session.
If 'id' attribute then restore from session to page.
If neither then remove attribute from session.
SKIP_BODY exception: JspException -