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CRect wndRect;
GetClientRect(&wndRect);
CBitmap btp,*pOldBitmap;
btp.LoadBitmap(IDB_BITMAPBK);
CDC dcMemory;
dcMemory.CreateCompatibleDC(pDC);
pOldBitmap=dcMemory.SelectObject(&btp);
pDC->BitBlt(0,m_nybk,wndRect.Width(),wndRect.Height()-m_nybk,&dcMemory,0,0,SRCCOPY);
dcMemory.SelectObject(pOldBitmap);
dcMemory.DeleteDC();
return TRUE;