Login Form

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Description:
Displays a Login Form which users must submit in order to log in to the site.

Accessible by:
Users who are not logged in

Accessed from:
Main Menu for users who are not logged in
Input parameters:
None

Output
Login Form

Pseudo Code:

get/create session
if (there is no 'username' param in the session) { // user isn't logged in
   display the Login Form
}
else {
   display an error message
}