Conditional Formatting Of Empty Cells

Is there anyway to use conditional formatting to do the following:

If a cell has value and a cell below it doesn't have value, then highlight both cells. However, as soon as the blank cells are not blank, then both cells would clear the highlight.

In the example below, cells A1 and A2 on column A would be highlighted. Cells B3 and B4 on column B would be high lighted. Whenever cell A2 is filled in, then the highlight would clear. This logic would apply from column A through column Z.

Code:
A1 Description 1 B1 Description 8
A2 blank cell B2 Description 9
A3 Description 3 B3 Description 10
A4 Description 4 B4 blank cell

I tried using two conditional formatting (one to high light and one to clear) but doesn't seem to work.