Hi.. can somebody please help?

I need to increase my Desktop space (have all my application toolbars on secondary monitor and my working window on the primary one). I have a Desktop with Windows XP and the Motherboard has a builtin nVidia graphics card. The card supports multiple monitors as far as I know but there is only 1 VGA output available. If I connect a simple VGA splitter will I be able to use the multiple monitor feature or do I need additional hardware?

Thanks