Conditional Formatting

One column of data, 1,000's of cells long.

I am trying to highlight cells that are a predetermined difference from the cell above.

A1 10
A2 11
A3 15
A4 40
A5 39
A6 50


If my diference was greater than 10 then the cell above, cells A4 and A6 would be highlighted.

Anybody know the formula?

Thank you