Display sub products

hi

i am not making a menu it will show products sub products in that list.
here is my question again
there are four products in my list
product 1             Image of sub product 1a   image of sub product 1b
product 2
product 3
product4
there are 2 div in 1st div there is the product list and if i click on the any product from that list is should display its subproducts in next div
if i click the next product then previous sub products should be hidden and sub products of these one should be display.
can u give eg how should i do this
 

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