RadioButton list problem

Question

HI friends,
I have two RadioButtonList in vertical ,
named radioBtnVertical1 and radioBtnVertical2.
when i select a radiobutton from radioBtnVertical1 at the same time radiobutton(adjacent to another radio button)  from radioBtnVertical2 should not be selected...
Plz any body can give me the solution.
Thanks..
Mohammad mujtaba