Changing hard disk for Macbook Pro

Sorry to start another thread, sincet he previous thread is about ram, thought should have start a different one because I have queries regarding the hard disk in Macbook Pro

I have been limited by the space capacity in my laptop and recently wonder if it's possible to do an upgrade of hard disk within macbook pro. I know it is better to get an external hard disk but there are certain amount of space that I need within my laptop for my works, also for speed sake.

Let me know if it's possible. My computer setup is this:

Model Name: MacBook Pro (Year 2008)
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP41.00C1.B03

Hard Disk Information:

Intel ICH8-M AHCI:

Vendor: Intel
Product: ICH8-M AHCI
Link Speed: 1.5 Gigabit
Negotiated Link Speed: 1.5 Gigabit
Description: AHCI Version 1.10 Supported

FUJITSU MHY2200BH:

Capacity: 200.05 GB (200,049,647,616 bytes)
Model: FUJITSU MHY2200BH
Revision: 0081000D
Serial Number: K43B **81DY
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Medium Type: Rotational
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
Volumes:
Macintosh HD:
Capacity: 165.36 GB (165,356,240,896 bytes)
Available: 46.59 GB (46,594,908,160 bytes)
Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s2
Mount Point: /
Windows HD:
Capacity: 34.35 GB (34,348,204,032 bytes)
Available: 5.62 GB (5,622,022,144 bytes)
Writable: Yes
File System: NTFS-3G
BSD Name: disk0s3
Mount Point: /Volumes/Windows HD

<Edited by Host>