HELP- p/s fluid loss :(

I need help ASAP- please read...
Ok i drove to school and back no problem, left home and drove amile to bank and as i left the parking lot my p/s sounded terable.
I drive home, p/s sounded bad at every corner, i go to driveinto my drive way and i realized the steering was really hard all of a sudden so i park across the street. I go back to take a close look, almost all the Power steering fluid was out of the tank and about 1/3 was left on the ground, lost would be around town too. I can see it dripping from the driver's side like around the bottom of the radiator, car angle could have made it go to this side of the car.
I know the return hose comes up from the bottom passenger side of the radiator, i though the hose had cracked or poped off but it looks good where i can see it from top and bottom, if it was jacked up i coulda messed around and found the leak. What i need to know is where would it be leaking and why? it just happened in like 5 min of operation,lost almost all the fluid.
I need to know so i can try and fix this tomorrow, i need my car!

ask anything you want ill answer with what i know- Thanx