Don't take a spanish class. Just go to a spanish speaking country and learn there, you'll learn three times more when it becomes a part of youre daily life than if it's just a class that you have to take.
Okay, I'm Mexican and please don't watch Dora lol. Quickest way to learn spanish is to go on the internet and fine a translation for it and just say the words outloud. Just practice for 20 minutes or and maybe have a friend help you out. If you have any friends that already do speak spanish then ask them to help you
You would have to go to a Spanish speaking country to learn it fast. Other than that, you can listen to teaching tapes which helps some or find a Spanish speaking friend who will spend some time talking to you in Spanish.