Copying New sheets using formulas involving previous sheets

Hello all, I would greatly appreciate your help.

I have an excel file that is used to keep tabs on rental units. Each month is a new worksheet, so the worksheets across the bottom are November 08, December 08, etc. I am trying to make my sheet for January 09, and wanted to add a column for "Total Owed", so that the sheet would display the total amount owed by any tenant. So, for example, if a tenant didn't pay rent in November, the December sheet would pick up on it by showing total owed at the beginning of the month is XX"

This is a pretty simple formula that uses "Rent Due" and "Rent Paid" from previous sheets to show an outstanding balance. The way it is now, I started on December 08, referenced back to sheet November 08 to find out what the balance is for people going forward to December. Then I tried to copy and paste this sheet into January 08, but instead of pulling the data from December 08 (the previous worksheet) it wants to pull from back to November 08.

So.. the question is....is there a way to reference certain cells in the immediately previous worksheet without calling the sheet by name, so it will copy correctly when copied each month?

Here is the formula on the December 08 that is not copying correctly:

(=C2-E2+'November 08'!G2)

When I copy this to January, the formula should be:

(=C2-E2+'December 08"!G2)

But when i copy it into a new sheet, it always remains 'November 08'!G2

I know that I could just create the new sheet, change the first cell to 'December 08'!G2, and copy it down the sheet each time but I have colors, and different formats, etc. And this formula is only in every third cell sometimes and every fourth cell other times, so it would just make my life a lot easier if there was a way to get this copy to a new sheet correctly. Thanks!