How to solve the monitor shuffle? G4, G5, Cinema Display and 2 ViewSonics

Question

Here's a monitor puzzle I'm hoping to get some help with.
I have two computers- a G4 and a G5.
COMPUTERS
G4- 1 VGA port, 1 ADC port - video card is ATI rage 128 pro.
http://everymac.com/systems/apple/powermacg4/stats/powermac_g4450.html
G5- 2 DVI ports
http://everymac.com/systems/apple/powermacg5/stats/powermac_g5_2.7dp.html
MONITORS- 1 20" Cinema Display
- Two 17" LCD Viewsonic VG720 displays. Both monitors have a VGA and DVI output.
*What we need to do is have the Cinema Display on one computer, and the ViewSonics on the other in a 2-monitor setup.* It doesn't matter which monitors go where, as long as they work.
The ViewSonics can't do a simple 2-monitor setup on the G4. One of them can hook up to the VGA port. But the other one can't hook up to the ADC.
But since the ViewSonics are both DVI-compatible, they work great with the G5, with no problems.
This leaves the Cinema Display to be hooked up to the G4. The Cinema display is a DVI, but the G4 is only VGA and ADC. I bought a DVI to VGA adapter and hooked it up to the G4, but no response from the monitor. No luck.
Question 1: Would this work if I bought a DVI to ADC adapter?
I've seen this: http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore?productLearnMore=T27 74G/A
... But I don't want to buy it if it won't work either.
Other scenario:
I hook the Cinema Display up to the G5 (flawless) and try to put the 2 ViewSonics on the G4. One will hook up to the VGA just fine, but then I'm left trying to convert either a DVI or a VGA to the G4's ADC.
Question 2: If I buy an adapter for this purpose, could I do a 2-monitor hookup with a VGA and an ADC on the G4?
Thanks for helping!
Owen

Answer 1

Thanks for your response--
I looked at this adapter:
http://www.mycableshop.com/sku/ADCHD1506.htm
However, it says this:
"The adapter cable allows any VGA monitors to be connected to the new dual-display G4 system with ADC video interface. The VGA monitor can be used as the primary display, or as a second display on G4 that supports dual-monitor support. Compatible with GeForce 4 MX, GeForce 4 Ti, Radeon 7500, and Radeon 9000 Pro."
My graphics card is a ATI Rage 128 Pro. Will it not work, then?
What is the possibility of adapting the Cinema Display from DVI to ADC?
Thanks!