Invalid cookies should prompt for login/password
Short, concise description of the idea
Rather than direct people to log out and log back in, put the login form on the error page which complains about invalid cookies
Full description of the idea
"If the space above isn't enough to describe your suggestion, you may write a more thorough and detailed explaination here." This statement tends to suggest that this is an optional field, and would be unnecessary if the short, concise description of the idea is deemed sufficient.
An ordered list of benefits
An ordered list of problems/issues involved
An organized list, or a few short paragraphs detailing suggestions for implementation