Hi Kimberly,
Finally got around to looking at this one.
I actually found a more detailed "how-to" at this link:
http://forums.techarena.in/microsoft...ct/1342084.htm
If you read Steve House's suggestions for formulae, and then use JulieS and m3lyssa's corrections, it all works out. m3lyssa multiplied by -1, but you can just swap the order of the fields inside the brackets and the result is the same.
Once the ES, EF, LS and LF fields were defined, it was just a question of tweaking the box template formatting until it looked the way I wanted it to.
Cheers,
Benson