[eluser]Phil Sturgeon[/eluser]
Agreed, I answered the question in the title without reading all of the post. You want to make a controller that the form can be sent to, no matter what page the form is being shown on.
Example, have a controller called account.php then have a method called login() which will have the validation in. Set the form action to /account/login and bingo.
You only have the validation in one page and you have the effect you wanted.
