Desparately in need of help!!!

What I am trying to do is find the conditional formatting that is going to
highlight the "Not equal to" cells.

In other words, below I have sample cell rows to the left (1,2,3,...), a
column "A" and then I have two sets of matching #'s, one below another.

I did a conditional formatting (from cell B2) that said "Cell Values is"
"Not equal to" "=B$1"...I set it to highlight/shade when one of the two cells
is not equal to the other.

It works great for the 1st 2 rows...however when I do a paint formatting
from B2 down to the rest of the row, it formats the wrong cells & every other
cell highlights...In other words...B3 not equal to B2, B5 not equal to
B4....and so on!!!

PLEASE...I'm desperate.....can someone help!!!

A
1 83543520
2 83543520
3 09341720
4 109341720
5 7503362001
6 7503362001
7 0501652001
8 0501652001
9 94485620
10 94485620
11 22122520
12 22122520