Multiple displays with 15"and 19"monitor using a VGA splitter on my Mac Pro

Hi, so I have a brand spanking new Mac Pro and have been using a cheap, basic 15" monitor with it. As I'm doing lots of Edit/graphics work I've just purchased a new monitor, it's a 19" Acer flatscreen. Now I'm hoping to work the same display across both monitors, so I can set up my preview window on the 15" and do my work on the 19" screen.
The Mac has two DVI output sockets in the back, both monitors are VGA but I only have one DVI to VGA adaptor. Though I do have a VGA splitter! So I've tried going from one DVI socket to VGA, then put the splitter into that and then each monitor into each split socket, if that makes sense? I now have the same display on each screen i.e. while I'm typing this I'm looking at it twice but I want to see it once over two screens, how do I adjust this, there's no option in display settings?
Is it simply that I need to buy another DVI to VGA adaptor and use the other port? Just looking to save myself a tenner, that's all!
Thanks!
Alex

Yep, you're right! Thanks, working now, very useful.

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Multiple displays with 15"and 19"monitor using a VGA splitter on my Mac Pro

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