// on key press
	g_abOnKeyPress[K_UP] = !g_abKeyPressed[K_UP] && isKeyPressed(VK_UP);
	g_abOnKeyPress[K_DOWN] = !g_abKeyPressed[K_DOWN] && isKeyPressed(VK_DOWN);
	g_abOnKeyPress[K_LEFT] = !g_abKeyPressed[K_LEFT] && isKeyPressed(VK_LEFT);
	g_abOnKeyPress[K_RIGHT] = !g_abKeyPressed[K_RIGHT] && isKeyPressed(VK_RIGHT);
	g_abOnKeyPress[K_SPACE] = !g_abKeyPressed[K_SPACE] && isKeyPressed(VK_SPACE);
	g_abOnKeyPress[K_ESCAPE] = !g_abKeyPressed[K_ESCAPE] && isKeyPressed(VK_ESCAPE);
	g_abOnKeyPress[K_BACK] = !g_abKeyPressed[K_BACK] && isKeyPressed(VK_BACK);
	g_abOnKeyPress[K_RETURN] = !g_abKeyPressed[K_RETURN] && isKeyPressed(VK_RETURN);

	// update current status
    g_abKeyPressed[K_UP]     = isKeyPressed(VK_UP);
    g_abKeyPressed[K_DOWN]   = isKeyPressed(VK_DOWN);
    g_abKeyPressed[K_LEFT]   = isKeyPressed(VK_LEFT);
    g_abKeyPressed[K_RIGHT]  = isKeyPressed(VK_RIGHT);
    g_abKeyPressed[K_SPACE]  = isKeyPressed(VK_SPACE);
    g_abKeyPressed[K_ESCAPE] = isKeyPressed(VK_ESCAPE);
	g_abKeyPressed[K_BACK]   = isKeyPressed(VK_BACK);
	g_abKeyPressed[K_RETURN] = isKeyPressed(VK_RETURN);