Accessing pointer from scripts

I created a small class (SplashScreen) with just a few functions to create and destroy a dialog box. In winWindow.cc, just before WinMain, I added:

static SplashScreen* m_pSplash;

In WinMain, I added:

m_pSplash = new SplashScreen(hInstance);
m_pSplash->Load();

Everything works fine up to this point. As soon as the app starts, the dialog box pops up. How do I call my functions for this object from the scripts? I want to call 'm_pSplash->Unload();' from within the scripts, but am not sure how. Thanks.