Adria return or one way flight London Luton - Ljubljana Slovenia and vice versa ?

I have on line TICKETS for - Adria Airways flight on 12/08/2012 from Luton Airport to Ljubljana, Slovenia and - Adria Airways flight on 02/09/12 from Ljubljana to Luton Airport both flight include meal and 1 check IN bag Change of name required - I think £60 for each ticket - very easy as Adria answers calls straight away- free phone number SELLING THEM SEPARATELY OR TOGETHER 07904082949