Using Excel 2007 on a network where some computers have Office 200
 

I have a small network at my business with 6 computers. Three run Office 2007
and three run Office 2000. The color selections to fill cells are different
in the two versions, and as a result if I fill a cell with a color using 2007
and then open it in the 2000 version, it changes the colors to 2000 colors,
and those changes hold even when I open the spreadsheet in Excel 2007. Does
anyone know if there's a way to either a) change the color settings in Excel
2007 to match those in 2000 or b) make it so even if the spreadsheet is
opened in Excel 2000 the color changes aren't permanent? Thanks for your help!