Hi, I am trying to work with two dell monitors that have only VGA inputs. My goal is to have 3 screens. The macbook pro screen, and the two monitors. I currently have 2. The first monitor and the macbook pro screen. I am using a mini DVI to vga adapter for the first monitor. Is there a way to use the 3rd monitor also? Is a usb to vga the path to take? Would this work at the same time as the mini DVI to vga? Im running OSX Snow Leopard 10.6.7 on 2.3 GHz Intel Core i5 4GB Ram Thank you in advance.