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InterpolatingFunction


Who can help me? I am studying mathematica and I ask the following 
question. Suppose I wish to study the function y[t] defined by the 
oversimplified differential equation

sol:=NDSolve[{y''[t]+y[t]==0,y[0]==1,y'[0]==1},y,{t,0,20},
MaxSteps->2000]

How can I find ALL the roots of y[t]=0 in the range {t,0,20}?
I have tried a lot of things but they don't work. Mathematica user's
guide does not help me very much.
This kind of question arises when trying to draw Poincare sections of 
chaotic motions in dynamics.
Since I am not yet registered in a mathematica group, please reply to 
my personal address: ahautot at ulg.ac.be
Thank you in advance, AH.


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