Which do not want there to be a member pack will add to the shopping cart!

[www.suma.ir]

Hi
I usually store my products http://www.suma.ir/ I'm doing to pack
For example PHP Training Film Series
http://www.suma.ir/product.php?id_product=531
Existing products as well as your individual pack (set) to separate the store you buy em vase
The problem now is that over 90% of customers do not care and they also pack the vase so they choose to buy a number of products available and you just pack it
I want you to know that when there is a way Prsta customer training video series, for example PHP I'll add to cart, from which she set Ntvnh else you want to add to cart?
When asked make it give him a warning??
I'm grateful if anyone help me Baladeh
Good luck