vacation accrual calculation formula

[kisboros]

Dear Gurus,
I have attached a partial vacation accrual worksheet I would like to modify. I would like to modify the formula in column N so that if somebody is terminated in the first 15 days of a month and that date is entered in column J, they get 1/2 of the month's accrual, and then it stops. If the are terminated after the 16th, they get a full month's accrual and then it stops.
All help is appreciated. Thanks!