Make cell style for all workbooks

[adder70]

I made a few cell styles pretty easily that I planned to use for all of my spreadsheets. How can you have a cell style show up in the cell style dialog box in all spreadsheets, not just the ones that have that style?

I see that you can paste in a group of cells with those styles, but I'd like to avoid having to do that for every spreadsheet.

Oh, version is Excel 2007 on Windows XP.