Dell Studio 1558 Video Card Replacement

Hi,

I'm trying to play Skyrim on my laptop but I don't think my video card is good enough as my FPS averages out at 10. Just wondering if it is possible to upgrade the video card easily or am I looking at an impossible task?

I'm running:

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System Information
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Time of this report: 12/8/2011, 20:14:45
Machine name: ALEXBURTON-PC
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.110622-1506)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Studio 1558
BIOS: Ver 1.00 BIOS A12 PARTTBLr
Processor: Intel(R) Core(TM) i3 CPU M 350 @ 2.27GHz (4 CPUs), ~2.3GHz
Memory: 4096MB RAM
Available OS Memory: 3956MB RAM
Page File: 3202MB used, 4708MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

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Display Devices
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Card name: ATI Mobility Radeon HD 5400 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x68E0)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_68E0&SUBSYS_04131028&REV_00
Display Memory: 2736 MB
Dedicated Memory: 1014 MB
Shared Memory: 1722 MB
Current Mode: 1366 x 768 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: unknown
Monitor Id: AUO22EC
Native Mode: 1366 x 768(p) (60.008Hz)
Output Type: Internal
Driver File Version: 8.17.0010.1041 (English)
Driver Version: 8.762.0.0