Designing Kitchens and Bathrooms - replace exsisting bath faucet

Hi everyone,

I just purchased a new house this summer.
The bath tub has no shower connection, due to the fact that the shower is seperate.
Here is my question:
How can add a showerhead to the bathtub?
I saw these faucet-type with little showerhead, I want to install this but I have no idea how to start...

the present faucet is on the side of the bath and not on the wall.
Do I have to undo tiles?the wall?
can I just undo the present one, drill a 4th hole for the showerhead?
any light on this will help

thanks again for any help

No simple answer here. Is the wall that has the valve and inside wall or outside?? Any access from behind?? There are cheapy solutions where you can change the tub spout and add a flex tube and spray fixture, not always satisfactory. Need more info.

Typically a bath/shower faucet is installed in the wall with some four soldered joints at the faucet plus water relief tail pipes for water hammer prevention. A fairly large hole is needed in the wall, and because of likely problems matching tiles, you are usually looking at a complete re-tile job after fixing the hole in the wall. If you don't want to go to that much work, then perhaps Just Bill's solution is what you need.

No simple answer here. Is the wall that has the valve and inside wall or outside?? Any access from behind?? There are cheapy solutions where you can change the tub spout and add a flex tube and spray fixture, not always satisfactory. Need more info.

hxxp://www.homedepot.ca/webapp/wcs/stores/servlet/CatalogSearchResultView?D=948500&Ntt=948500&catalogId=10051&langId=-15&storeId=10051&Dx=mode+matchallpartial&Ntx=mode+matchall&recN=112413&N=0&Ntk=P_PartNumber

here is what I want to install, I have basically the samething but without the shower head.

I will try to post some pics