Required coding to implement a timer in a jsp page

amrita_it06

Can any one help me by providing coding regarding this or can even give some suggestions.I have to attach a timer in a jsp page which is generating questions randomly and this jsp page will expire after the time is out.The random question generation has been done using java beans but the problem is with this timer which i cannot implement succesfully which i hav also tried 2 implement using java beans but as the bean is called severaltimes due 2 the random generation of questions the timer starts again from the time assigned.If anyone can also provide coding on automated examination system then it is also fine which obviously contains this concept of timer.