OPENGL noo--bee, fullscreen problems

Here I have part of an OPENGL program that ultimately shows a triangle rotating...that isn't important. What is important is the three errors I get in the block of following code...btw, it is for creating a fullscreen window:

Code:

	//fullscreen stuff needs to be done before the window is created otherwise weird things can happen!!!!
	DEVMODE devModeScreen;
	memset(&devModeScreen, 0, sizeof(devModeScreen));
	devModeScreen.dmSize = sizeof(devModeScreen);
	devModeScreen.dmPelsWidth = 1024;	//You are supposed to use the same width and height in the DEVMODE
	devModeScreen.dmPelsHeight = 768;	//datastructure as when you actually create the window
	devModeScreen.dmBitsPerPel = 16;	//This should probably be the same...currently my system is running in 16bbp
										//so it seemed like a good idea to use 16

	devModeScreen.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;

	if(ChangeDisplaySettings(&devModeScreen, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)
		fullScreen = false;

	if(fullScreen) {
		extendedWindowStyle = WS_EX_APPWINDOW;
		windowStyle = WS_POPUP;
		ShowCursor(false);
	}
	else {
		extendedWindowStyle = NULL;
		windowStyle = WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_SYSMENU | WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
	}




	hwnd = CreateWindowEx(NULL,	//window creation
		"MyClass",
		"The OPENGL windows application",
		WS_OVERLAPPEDWINDOW | WS_VISIBLE | 
		WS_SYSMENU | WS_CLIPCHILDREN |
		WS_CLIPSIBLINGS,
		100, 100,
		1024, 768,
		NULL,
		NULL,
		hInstance,
		NULL);

If you know any opengl the code should be easy to understand...my three errors are:
--------------------Configuration: opengl - Win32 Debug--------------------
Compiling...
main.cpp
C:\WINDOWS\Desktop\opengl\main.cpp(133) : error C2065: 'extendedWindowStyle' : undeclared identifier
C:\WINDOWS\Desktop\opengl\main.cpp(134) : error C2065: 'windowStyle' : undeclared identifier
Error executing cl.exe.

opengl.exe - 2 error(s), 0 warning(s)

well what do you know, only two errors, hot dog!

Thanks if you can explain what I did wrong.

did you declare

extendedWindowStyle
windowStyle

anywhere?

put this line at the top of the function

DWORD extendedWindowStyle,windowStyle;

Also, you don't have to switch fullscreen before you create the window I always switch to fullscreen after I've created the window