Conditional formatting. Highlight cells that meet a criteria but ignore blank cells.

-I have two columns of numbers.
-There are blank cells in each column that appear sporadically.
-In each row of numbers, I want to create a conditional format that highlights a cell if the number in the cell is greater than a designated value.
-Currently I am using: Conditional formatting 'formula' =ABS(C4-C3)>.1 OR =ABS(D4-D3)<.1 for the respective column of numbers.
-This formula does not work now that I have empty cells between the values. All the blank cells are highlighted and the subtraction can not take place if the cell is blank.
-I want the formula to not see the blank cells and make the comparison between the first vale and the next vale in the series.
-I do not want to sort the blank rows out and then replace.
Thank you,
Daniel

Please see attachment: TESTAE042701.csv