How do we play this river, and is the rest of my line alright?

Full Tilt Poker Game #1128788331: Table Grand Canyon - $0.10/$0.25 - No Limit Hold'em - 10:41:27 ET - 2006/10/21
Seat 1: dallaschole ($17.95)
Seat 2: irisha1234 ($6.15)
Seat 3: chauncy100 ($26), is sitting out
Seat 4: zelico ($24.30)
Seat 5: plumberboy69 ($54.05)
Seat 6: pexiM ($22.10)
Seat 7: stupidfool ($24)
Seat 8: ChrisCroz ($27.05)
Seat 9: ilir ($25.25)
plumberboy69 posts the small blind of $0.10
pexiM posts the big blind of $0.25
The button is in seat #4
*** HOLE CARDS ***
Dealt to ChrisCroz [7s 7h]
stupidfool folds
ChrisCroz calls $0.25
ilir folds
dallaschole calls $0.25
irisha1234 calls $0.25
zelico folds
plumberboy69 calls $0.15
pexiM checks
*** FLOP *** [Ah 7c 5d]
plumberboy69 bets $1.25
pexiM folds
ChrisCroz calls $1.25
dallaschole folds
irisha1234 folds
*** TURN *** [Ah 7c 5d] [4h]
plumberboy69 bets $1.50
ChrisCroz raises to $4
plumberboy69 calls $2.50
*** RIVER *** [Ah 7c 5d 4h] [3h]
plumberboy69 has 15 seconds left to act
plumberboy69 bets $11.75
ChrisCroz calls ...