How to change Linux dual-head screen numbers?

I've got a dual-head setup working under Linux with a 6200A,
but no matter what I try, the CRT connected to the VGA
connector is screen 0.

Adding "Screen 0" or "Screen 1" options to the Device section
has no effect at all, and changing the screen numbers in the
ServerLayout doesn't work either. The :0.0 screen always ends
up assigned to the VGA connector, and :0.1 to the DVI connector.

How do I get the DVI output to be screen 0?

--------------------xorg.conf--------------------
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "CRTScreen" 0 0
Screen 1 "LCDScreen" rightof "CRTScreen"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
FontPath "/usr/share/fonts/misc/"
FontPath "/usr/share/fonts/TTF/"
FontPath "/usr/share/fonts/Type1/"
FontPath "/usr/share/fonts/CID/"
FontPath "/usr/share/fonts/75dpi/"
FontPath "/usr/share/fonts/100dpi/"
EndSection

Section "Module"
Load "extmod"
# Load "dri"
Load "dbe"
Load "record"
Load "xtrap"
Load "glx"
Load "type1"
Load "freetype"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc101"
Option "XkbLayout" "us"
Option "XkbOptions" "compose:ralt, ctrl:nocaps"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
Identifier "CRT"
VendorName "Samsung"
ModelName "Samsung SyncMaster 700IFT (CSH780xbB*)"
HorizSync 30-96
VertRefresh 50-160
Option "DPMS"
EndSection

Section "Monitor"
Identifier "LCD"
VendorName "Samsung"
ModelName "Samsung SyncMaster 204B"
HorizSync 30-96
VertRefresh 50-160
Option "DPMS"
EndSection


Section "Device"
Identifier "GeForce0"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "NV44A [GeForce 6200A]"
BusID "PCI:1:0:0"
Screen 0
EndSection

Section "Device"
Identifier "GeForce1"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "NV44A [GeForce 6200A]"
BusID "PCI:1:0:0"
Screen 1
EndSection

Section "Screen"
Identifier "CRTScreen"
Device "GeForce0"
Monitor "CRT"
SubSection "Display"
Modes "1152x864"
Viewport 0 0
Depth 24
Virtual 1152 864
EndSubSection
EndSection

Section "Screen"
Identifier "LCDScreen"
Device "GeForce1"
Monitor "LCD"
DefaultColorDepth 24
SubSection "Display"
Modes "1600x1200"
Viewport 0 0
Depth 24
Virtual 1600 1200
EndSubSection
EndSection
--------------------xorg.conf--------------------


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