Radeon X1650 Series

I volunteer at a church that uses a computer to display images on a projection screen. We use two monitors. One as the main computer display and the other as a preview for what is being shown on the projector. The display card that is installed is the Radeon card. It has 1 vga, 1 svideo and 1 dvi. I want to use the dvi output for the projection system. One of the monitors has an svideo input so I would like to plug that into the svideo jack on the computer and then use the vga for the preview monitor. Quality is not a major issue but I want it to look nice. How do I configure all this with no instruction manual available?