Photoshopping photo compression

Ok, my dad’s doing a ‘musical’ (Phantom of the operating theatre), for a hospital revue (for charitee). Anyway he’s getting me to make a powerpoint of some pictures (mainly photoshopped ones).

Anyway 1 example is a picture I took of aeroplane jelly, and ‘photoshopped’ it to make it xylocaine jelly, which is a type of lubricant i’m told.

Anyway i edited it in fireworks mx, now its 2.4mb and takes forever to load on the powerpoint. How can i make it less quality just using fireworks, i can’t find it anywhere.

Cheers, Dr Warm.