Conditional formatting two columns

[Bupitz]

Hi guys.
I want to format 2 columns in order to have the smaller value green and the bigger value red, like in the picture.
I can do it for a row and paste the format only to another row but not to multiple rows.
How can I do it for the whole column ?
Thanks in advance,

Bupitz

2013-02-13_193132.jpg

[martindwilson]

use the greater than and less than options
say in cell a1 use cell value is greater than =$b1 pick colour green
then set a second condition of cell value is less than =$b1 pick a colour red
copy down column a
repeat in b1 but reversed
cell value is greater than =$a1 set as green
then set a second of cell value is less than =$a1 set as red
copy down b

[Bupitz]

I did it in another way. Made another column with an "if" to compare the values, got TRUE or FALSE results, made a filter and them I put the colors manually.
I thought there is an easier way ....

Thanks!