imac g5

i have a 20 inch Imac g5, and i am wondering if i can connect another display to it. I wanted 2 connect a 17 inch apple studio display but dont know if i can as the imac g5 needs to connect a monitor through? a VGA adaptor. Has the 17 inch display got that port, as i know it has DVI and stuff?

http://www.macworld.com/weblogs/editors/2004/10/imacscreenspanning/index.php

You'll need a DVI-VGA adapter (iMacs only have VGA) and Screen Spanning Doctor to enable extended desktop mode.