Today I noticed that there was something leaking from the underside of my IS200 SE near the front where the radiator is, I inspected it and it was a browny/orange colour. Upon starting the car and driving it I found that my power steering had completely gone and the steering was really stiff. I stopped again and looked at the power steering fluid tank and it was completely empty, I then followed the tubes which carry it away/to the tank and found that where the tube passes underneath the radiator fluid had leaked hence the leaking I saw earlier on. I can't think of any reason for this suddenly happening, I have not hit anything or driven recklessly or anything, it is most puzzling. What I want to know (and I'm not sure I want to know the answer to this one!) is : has my power steering completely gone or is it fixable, i.e. does the tube need replacing or can I just replace the fluid. Thanks in advance for any help.