Identification: Plant with long leaves

Does anyone knows the name of this plant?

I've bought it a week ago and now lower leaves are falling and turning yellow. I water it twice a week, and it's given indirect sun light. Can you please help?

 

Looks like Codiaeum variegatum. Common name Croton. It is one of the narrow leaf forms.

http://images.google.com/imgres?img...textMenu&rlz=1I7SUNA_en-GB&sa=N&start=18&um=1

http://en.wikipedia.org/wiki/Codiaeum_variegatum

 

The seller told me it's Aucuba, but it doesn't look like that. Does it?

 

Not Aucuba. It is definitely a Croton!