Dual monitor on intel 945

I am trying to extend my screen to an external monitor on my laptop, but when I use sax2 it always ends up cloning and setting the resolution very low, i believe it is 1024x768 (it is also only showing a portion of the screen since my laptop screen resolution is 1440x900.

i was looking this up and i read somewhere that someone used xrandr, i tried this and i tried setting screen resolution to many different sizes by using -fb, but it did not work, i always got the following message

xrandr --output VGA --fb 1440x900 --right-of LVDS
xrandr: specified screen 1440x900 not large enough for output VGA (1024x768+1440+0)

can anyone help me out?