Help with a forumla, IF or DIFF???

I'm not great with Excel 2010 but I get by.

I need to write a forumula which compares the difference between two numbers in two cells and writes a word in the third cell. The rule is B1 - A1. If that resulting number is less than -0.25 then it's "good" if it's more than -0.25 but less than 0.25 then it's "ok" and if it's more than 0.25 then it's "bad". The other problem I have is A1 is on a page called "clock" and B1 is on another page called "times" so it makes it more complicated. So far I have this forumla

=IF(('times'!B1-clock!AL36)<0.25,"good") So this works for less than 0.25 but how do I add to the forumla for between -025 to +0.25 and more than 0.25


A B C
4 3 good


A B C
4 4.1 ok (C is OK as A and B are within the limit -0.25 and +0.25)


A B C
4 4.3 bad (B1is more than 0.25 greater than A1)



My brain is wrecked. Happy new year too.

Iain