How to Use Javascript with ASP RadioButton?

Hello,
    I have to do the validation on the Client Side when the one of the Radio Button Clicked from 3 of them. I know how to write the JavaScript Function but i am confused where i have to use this function by using ASP Radio Buttons.
  I mean on which event of the RadioButton i have to fire the function of javascript. Because there is no any client side event like onClientClick on ASP radiobutton.
 
So, Please help me to solve this problem.
 
Thanks
 
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