So you are saying that if (using your example) you select any cell in row 11 (active row) and there is something in L11 and K11 or M11 the cell would highlight. If you then select a cell in row 12 the cell in row 11 would un-highlight regardless of the condition of L11,K11 & M11?
If this is the case I'm not sure if conditional formatting could do that. VBA may be required.
Gary