Run sub before sheet is printed?

I would like to force a sub routine to run whenever the File, Print command is used on a particular sheet. Is this possilbe?

Yes, I have a custom Print button on the sheet, but the users can still select the File, Print command and print bad data.

Yes I also know I can run the sub routine whenever it the sheet is activated, but the routine takes some time and I would rather not do that.

Thanks for your help.

Excel 2000