Add a Prompt Java message CRM 2011

Hi,

I would like to know if it's possible to add a Java prompt message in the way that when a CRM user wants to log in in CRM he will have a prompt Java message and he will have to click OK before log in to CRM.

The same prompt message will appear when he tries to log in to CRM from Outlook.

Any help on how to do that will be much appreciated.

Thanks for the help.

Maarouf