dual/overlapping image

hi,
before i purchase the pro version, i’d like to know if it can support my need –

i am opening a shop, printing original designs on t-shirts. i have a wide verity of “blanc” shirts from which my user can choose to print mt design on – now here is what i need :
my design is my product. i need the same design to appear on the different types and colors of shirts i have available. i need the variety images as background to the product image, and that both will be visible to the user at the same time.

http://www.mooz.co.il/products/%D7%AA%D7%A4%D7%95%D7%96 – you can see an example of what i mean in this example site – there are 2 images on display – a PNG of the design hovering above the Jpeg of the type color and size of shirt is placed behind the PNG.