messedup screen resolution

Hi
Recently I set the screen resolution of my ubuntu 8.10 too high. On rebooting, I got the message "signal out of range"; i could not get the desktop. After an extensive google search, I found the following solution for which I am grateful to a lot of kind souls. I rebooted the pc with a live cd of Ubuntu 8.10. This gave me access to my hard drive. I navigated to /etc/x11/xorg.conf under nautilus and added the following script to the file.
Section "Monitor"
Identifier "Configured Monitor"
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
Modeline "1440x900_60.00" 106.47 1440 1520 1672 1904 900 901 904 932 -HSync +Vsync
Modeline "1440x900_75.00" 136.49 1440 1536 1688 1936 900 901 904 940 -HSync +Vsync
Gamma 1.0
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 1024 768
Modes "1440x900_60.00" "1024x768@60" "800x600@60" "800x600@56" "640x480@60"
EndSubSection
EndSection

Section "Module"
Load "glx"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
EndSection

Section "Device"
Identifier "Configured Video Device"
Driver "fglrx"
EndSection
This solved the problem