Excel 2007 : conditional format based on date range

Hi,
Here is my scenario.
Column A contains a short date eg 01/12/2011
Column B has a formula that adds 365's to column A

I would like to insert conditional formatting into Column B as follows :

If the current date is within 30 days of the date in column B then the cell needs to turn Yellow.
If the current date is past the date in Column B it needs to turn red.

Select the B range (e.g. B4:B10) and then apply CF:

For yellow: =AND(B4<>"",B4<=TODAY()+30)

For red: =AND(B4<>"",TODAY()>B4)