i want to go 1280x800 (witch my computer supported in Windows XP)but it only goes up to 1024x768 witch looks weard on my LCD screen

is there a way to configure XWindows to use a higher resolution

Here are my computer specs

Everex StepNote NM3500W

Display: 15.4" WXGA Widescreen (1280 x 800)
Processor: 1.3GHz, Intel® Celeron® M Processor 350J
Memory: 256MB DDRII 533
Hard Disk Drive: 40GB PATA (4200rpm)
Optical Drive: DVD-ROM/CD-RW
Front-side Bus: 400MHz
Graphics: S3® Unichrome Pro (64MB shared memory)
Audio: AC '97 with Built-in Speaker
I/O Ports: (1) DB 15-Pin VGA Port, (3) USB, (1) Microphone Port, (1) Headphone Port
Modem: (1) 56K data/fax modem
LAN: (1) 10/100 Base-T Fast Ethernet
Wireless LAN: Built-in 802.11b/g
Pointing Device: 2 Button Glide Pad
Power Supply: 65 Watt AC-DC Adapter
Battery: 3-Cell, Rechargeable Lithium-Ion
Measurements: 14.1� x 10.7� x 0.9 - 1.5� (L x W x H)
Weight: 5.9lbs

please help