A member of my forum asked me to do this tutorial, so I am NOT responsible
for it's contents. I'm a good soldier and do what I'm told (lol)

So, that said I'll show you how to select an object...isolate it, and move it to a
different position in the image.

Another trick I show is covering up where the
object was moved from, and no I didn't use the clone tool.

Tools used in this tutorial are:
The Marquee Tool
The Free Transform Tool
The move tool

http://microstockpix.com/tuts/balloon2/balloon2.html