Move Window in mfc c++ without titlebar?

I am using this code to move the window. But this code does not work well. When I click anywhere on windows from it will move but i just want to move windows form. When i click on specific think. For example picture. I am using MFC C++ HtmlDialog. Anyone know how to do that?

DHTML_EVENT_ONCLICK(_T("image"), PreTranslateMessage)

BOOL CHtmlDlgTestDlg::PreTranslateMessage(MSG* pMsg)
{
if (pMsg->message == WM_MOUSEMOVE && (pMsg->wParam & MK_LBUTTON))
{
    CPoint p;
    GetCursorPos(&p);
    CRect r;
    GetWindowRect(&r);
    if (r.PtInRect(p))
    {
        ReleaseCapture();
        SendMessage(WM_NCLBUTTONDOWN, HTCAPTION, 0);
        SendMessage(WM_NCLBUTTONUP, HTCAPTION, 0);
        return 1;
    }
}

return CDialog::PreTranslateMessage(pMsg);    
}

WM_NCLBUTTONDOWN is a notification message, Windows sends this message and the program responds to it. The program should not send this message to Windows. In this case it works but it's not recommended.

I don't know how this code works: DHTML_EVENT_ONCLICK(_T("image"), PreTranslateMessage) it probably gets ignored and you can remove it. PreTranslateMessage is still called. You can restrict it to any rectangle within the Window, for example CRect(50,50,200,200):

BOOL CHtmlDlgTestDlg::PreTranslateMessage(MSG* pMsg)
{
   if (pMsg->message == WM_MOUSEMOVE && (pMsg->wParam & MK_LBUTTON))
   {
       CPoint p = pMsg->pt;
       ScreenToClient(&p);
       CRect r(50,50,200,200);
       if (r.PtInRect(p))
       {
           ReleaseCapture();
           SendMessage(WM_NCLBUTTONDOWN, HTCAPTION, 0);
           SendMessage(WM_NCLBUTTONUP, HTCAPTION, 0);
           return 1;
       }
   }
   return CDialog::PreTranslateMessage(pMsg);
}

If you want to move an element within the window you can use javascript:

Moveable/draggable <div>

Ps, normally you should use WM_NCHITTEST as explained earlier. This case is very unusual because it's HTML dialog. You should reconsider putting a normal title bar which users understand, or you could put html control within a dialog, then you can control the rest of the dialog with standard WinApi.