Replacing superdrive in 20" Core Duo iMac?

I purchased a new iMac last year and now have no need for my old 20" Core Duo so I was planning to sell it. However, I've noticed that the superdrive is no longer working and I reckon this will bring the price I could get for it down a fair amount.

Is it easy enough to replace these? I'm pretty technical and am confident I could replace it if it's possible and I can find the correct part etc.

Here's some info about my Mac:

Hardware Overview:

Model Name: iMac

Model Identifier: iMac4,1

Processor Name: Intel Core Duo

Processor Speed: 2 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 2 MB

Memory: 2 GB

Bus Speed: 667 MHz

Boot ROM Version: IM41.0055.B08

SMC Version (system): 1.1f5

MATSHITA DVD-R UJ-846:

Firmware Revision: FB2U

Interconnect: ATAPI

Burn Support: Yes (Apple Shipping Drive)

Cache: 2048 KB

Reads DVD: Yes

CD-Write: -R, -RW

DVD-Write: -R, -RW, +R, +R DL, +RW

Write Strategies: CD-TAO, CD-SAO, DVD-DAO

Thanks.