dll calling problems

[john tindell]

ive created a DLL and im trying to call it but it keeps giving me these errors.

Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

heres my code

#include <windows.h>

typedef void (*MSGBOX)(char*,int);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	HINSTANCE hDLL;
	MSGBOX msgProc;
	hDLL = LoadLibrary("dlltest.dll");
	if(hDLL!=NULL)
	{
		msgProc = (MSGBOX)GetProcAddress(hDLL,"msgbox");
		if(msgProc!=NULL)
			(*msgProc)("Batman its worked!", MB_OK);

		FreeLibrary(hDLL);
	}
	return 0;
}

cheers