Upgrading graphics card on ASUS K53U-RBR5

Hello All,

I am buying this laptop for my little brother who is fairly new to gaming. Since we set a price limit on Xmas gifts, I was thinking the ASUS K53U-RBR5 was pretty good start. I was curious if he would be able to upgrade the graphics card on this laptop should he become a more serious gamer. If so, what are his options? Below is a link for the item, and I've copied/pasted the specs so you don't have too hard.

http://www.staples.com/ASUS-K53U-RBR5-15.6-Laptop/produ...

Processor: AMD Dual-Core E-350 Mobile Processor
Memory: (RAM) 4GB
Memory Type: DDR3
Memory: Expandable to 8GB
Hard Drive Size: 640GB
Hard Drive Type: SATA
Optical Drive: SuperMulti DVDRW Drive
Display Size: 15.6"
Display Type: 16:9 HD (1366 x 768) LED-backlight
Operating System: Windows 7 Home Premium 64-bit
Battery Type: 6 cell 2.6mAh K53
Network Card: 802.11n, Integrated 10/100/1000 Mbps Fast Ethernet
Video Graphics: (specs say UMA w/0MB). I found out from the manufacturer that is technically is AMD Radeon HD 6310 Built-in E-350
Other ports: 4-in-1 card reader
# of USB slots: 3
Dimensions: 14.88"W x 9.96"D x 1.37"H
Weight: 5.73lbs.
Warranty: 1 year limited
Extra Features: Built-in Azalia compliant audio chip, with 3D effect
VGA Connection: 1
HDMI Port: 1

Thanks in advance for all your help!