addition using multiple worksheets

Hi folks, my first post here so don't knock me to much if I'm in the wrong place.
My problem is this
I need to know how to do some addition using multiple worksheets.This is my example.

sheet1 in cells B2 to G2 I have a number
in worksheet2 I am using cells B5 to G5 in each cell I have another number
How do I create a formula to add all these up.

If the different worksheets were using the same cells I can do it but because they are using different cell I can't.I am using ver 2003.
Thanks for any answers.
Nige.