One last request for a formulea

[John Holt]

Column G is the buy price, column H is the sell price, column J is the
profit and column K is the Loss, obviously column J is column H minus column
column G, how do I write a formulea for column K to show a value only when
column H is lesser in value than column G ie. a loss is made. I would like
column K to be blank if a profit is made and column J left blank if a loss
is made.
thank you in advance

John Holt