Donk keeps pushing....what to do?

[Lostit]

Villain in this hand is 78/24/3.5 The table is basically 5 2p2ers chasing him and he's catching bizarre hands laft and right. Early on I'd been running the guy over post flop but he's starting to push back now.
Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

Hero (MP): $89.50
CO: $51.50
BTN: $55.55
SB: $295.25
BB: $50
UTG: $48.60

Pre-Flop: J[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/spade.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to $1.75</font>, CO folds, BTN calls $1.75, SB calls $1.50, BB calls $1.25

Flop: ($7) T[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] (4 Players)
<font color="red">SB bets $4</font>, BB folds, Hero calls $4, BTN folds

Turn: ($15) 2[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">SB bets $5</font>, Hero calls $5

River: ($25) 4[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">SB bets $25</font>, Hero??[/i]

Granted, I should have probably re-raised the turn, but I was worried about losing the donk here. 2 questions:

A.) Would you call this river bet?
b.) What line would you prefer to take in this hand?

Also, if it helps anyone, the villain here was "Guldfeldt". He ended up holding court at this table for approx, 6-7 hours last night, and the waiting list for him was usually about 10 deep, so there may be a few of you out there who actually watched this table last night.