How to add button to CRM 2011 form?

I am not talking about Ribbon but but if you want to create button on Form Then Refrer below link

http://thecrmworld.wordpress.com/2011/04/27/how-to-add-button-to-crm-2011-form/

Important Link for MS CRM 2011.

http://technet.microsoft.com/en-us/library/aa682922.aspx
http://rc.crm.dynamics.com/rc/regcont/en_us/op/articles/statestatus.aspx