or multipliers for vga. That might help. With what you are trying to do, I don't think you'll be pleased. What happens is the signal amplitude gets divided and the display cannot compensate for the weak signal. It needs to be boosted to a proper level.
I'm trying to connect two inputs (laptop and Xbox) to my Dell Ultrasharp 2001FP monitor through the VGA port (obviously not to run simultaneously - I just don't want to have to change the cables round by hand every time). I'm not interested in a switcher box as I'm not bothered enough about it to use any extra electricity, so I thought I'd go for a simple splitter cable. I tried one of these - http://www.amazon.co.uk/150mm-monitor-splitter-cable-HD15M/dp/B0000992PQ/ref=sr_1_2?ie=UTF8&qid=1296065489&sr=8-2 - but the picture quality was pretty bad. I then bought a more expensive one (about ?5/$8) that looked like it had much better build quality, but the picture was no better. So my question is: is it worth me trying an even more expensive splitter cable, or do these types of cables always cause a reduction in picture quality? Does anyone have a link to a decent VGA splitter cable?