Where to put start() method ?

[fram3rate]

I'm having a hard time trying to figure out where to put my start() method in relation to the login form.

If I put start() before every piece of code or HTML then my login form is just stuck at the very top of my web page and doesn't look nice.

If I embeb the start() method inside my HTML then I get "header" errors after the first login:

"Warning: session_regenerate_id() [function.session-regenerate-id]: Cannot regenerate session id - headers already sent..."

I'm not sure the right way to do this, and I can't seem to find an answer.

Any help? Thank you....