Remember Starting Bank Question

Hi Guys,

I have a remember starting_bank trigger. Which runs once only at the start of the session.

I know how to set a trigger condition to make the trigger continue when the overall bank is greater than the starting_bank amount.

But what is the best way to write a trigger to stop/close block if the bank is 100.00 dollars or more DOWN on the starting_bank remembered amount?

Is it

selections trigger expression  -starting_bank   is equal or greater then 100

will the minus symbol in front of starting_bank do the trick??

I have not been unable to test this condition but need it to work "first time" if i am ever down the 100.00 dollars.

Your help would be appreciated, Thanks Bonecrusher