I'm sorry, It looks like I have to be the one to tell you..

A VGA splitter does not exactly "split" like most people think, it only clones the VGA output to two screens, but don't feel bad, MANY people fall into the same trap as the naming can make it very confusing (Hell I work in IT and one of my operations team suggested we buy the same thing for an extra screen until I told him how they work.)

The good news is, not all is lost, there are devices out there that can add extra monitors to your machine and only require a USB port like this:
http://www.lindy.com.au/news/USBtoVGAAdapter.htm

If you google "USB to VGA" you should get results in your own country.

The bad news is, there are a few problems with these devices;
1) They aren't cheap (In comparison to the splitter, I purchased a high end one for about $130AUS)
2) They do not use your GPU - To put it in non technical terms, these devices do not use your laptop video card, instead they rely on your CPU for power, so each screen that you add drains more time and power from your CPU which can have a noticeable impact on system performance.
3) They are not designed for 3D content, due to the way they work, they do not advertise the ability to display 3D content (games, etc.) because that would require massive work by the CPU.

But don't get discouraged by the negatives, I have not yet tried mine for WoW but I will give it a shot and let you know how it goes, as even though they say they aren't mean to be used for certain things, I know it works (mine displays our 3D apps and 1080P video content just fine)

So for the TL;DR, a splitter will only clone the output to two identical displays, it can't make 1 turn into 2, but there are devices that let you add another screen to your machine, however it would help if you could tell us what kind of laptop you have as it might not be able to handle multiple wow's anyways.

Also, also, as Vociferate said, ISBoxer would be the best thing for you anyways, it is an amazing program, and while it's a bit daunting at first, this community will always provide the care and help you need to get it running, and it will save you money and frustration trying to get a 3 monitor setup working on your laptop.

Hope this helps