Backpacking Across Europe on a $5000 Dollar Budget?

Is that $5000 Australian dollars or US? Will you be buying your airplane ticket with that money, or is that amount what you will have when you arrive for you trip? $5000 US over 3 months is around $83 a day, and thats enough to survive on. However that depends on how much travelling you will do. Will you spend 3 weeks in Spain in one place, or will you be taking a train to a new town every few days