Older Flash Players

Adobe offers older versions of their player specifically for Flash developers who are examining their sites from the perspective of users with older Flash Players.

http://www.macromedia.com/cfusion/knowledgebase/index.cfm?id=tn_14266

Also, to use the older player you will need to temporarily uninstall the Flash plug-in:

How to uninstall the Macromedia Flash Player plug-in and ActiveX control
http://www.macromedia.com/cfusion/knowledgebase/index.cfm?id=tn_14157