External LCD display

Dear All,
I would like to connect my powerbook with external 19" LCD display. But I only can find the resolution as follows
640x480
720x480
800x600
896x600
1024x768
1152x768
1280x852
But the 19" LCD display can support 1440x900. But I can't find this resolution in above table. But I found the following info at ATI website.
https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folder ID=299
Does anybody have experience using ATI driver before !? Please advise.
Ciao,
KK Lin

G'day mate
Thanks for the reply from Oz.
Just had another good look at the back of the external LCD and it has got both VGA and DVI ports on it. Which will get the best results do you think?
Also here is a dump re the graphics card in my iMac -
GeForce FX 5200:
Chipset Model: GeForce FX 5200
Type: Display
Bus: AGP
Slot: AGP
VRAM (Total): 64 MB
Vendor: nVIDIA (0x10de)
Device ID: 0x0329
Revision ID: 0x00b1
ROM Revision: 2103
Displays:
iMac:
Display Type: LCD
Resolution: 1440 x 900
Depth: 32-bit Color
Built-In: Yes
Core Image: Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Display:
Status: No display connected
As you can see, the card is a GeForce FX 5200. The web site refers to iMac G5's with GeForce FX 5200 Ultra cards and not the GeForce FX 5200. (My iMac is a Rev A machine).
Do you think this will cause issues? I need to run the iMac and the LCD at a show for my company and I am a bit concerned that I might end up with a Mac with no working display. Is that likely?
Cheers
David

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