No problem.  I thought you might have problems with the naming in particular but I was too lazy to write in more detail ;)

So, once again, with pictures!

This won't quite match the file that's up for download since I'm doing it again, but it'll still work.

step 1

Go to top view (numpad 7), delete the default square, and add a sphere (space-->mesh-->uvsphere).  You can keept the default number of vertices (32 and 32), it doesn't really matter for this. Do not leave edit mode (tab) just yet.

Go to front view (numpad 1).  We're going to scale it on all dimensions except for z.  Hit the "s" key, then hold shift and hit the "z" key.  Now type ".25" (without the quotation marks, of course) and hit enter.

Leave edit mode (tab) and move the sphere object down one unit by typing "g", then "z" followed by "-1" (again, no quotation marks) and hit enter.

Now make another one and move it up above the x-axis.  Shift-d will create a duplicate and put you in "grab" mode, so hit z to constrain the motion to the z-axis and type 2, then enter.  Now you have 2 spheres, one above the other.

Go to top view again (numpad 7) and create another sphere, then scale it along all axes to 25%--space, add-->mesh-->uvsphere, ok, ok, then hit the "s" key and type .25 and hit enter.

Leave edit mode and go to front view.  You should have something like the picture above.