!lButton::
    CoordMode, Mouse, Relative
    MouseGetPos, inWinX, inWinY, WinId
    if WinId =
        return
    WinGetPos, winX, winY, winW, winH, ahk_id %WinId%
    halfWinW = %winW%
    EnvDiv, halfWinW, 2
    halfWinH = %winH%
    EnvDiv, halfWinH, 2
    if inWinX < %halfWinW%
        MousePosX = left
    else
        MousePosX = right
    if inWinY < %halfWinH%
        MousePosY = up
    else
        MousePosY = down
    CoordMode, Mouse, Screen
    MouseGetPos, OLDmouseX, OLDmouseY, WinId
    SetWinDelay, 0
    Loop
    {
        GetKeyState, state, ALT, P
        if state = U
            break
        GetKeyState, state, lButton, P
        if state = U
            break
        MouseGetPos, newMouseX, newMouseY
        if newMouseX < %OLDmouseX%
        {
            Xdistance = %OLDmouseX%
            EnvSub, Xdistance, %newMouseX%
            if MousePosX = left ; mouse is on left side of window
            {
                EnvSub, winX, %Xdistance%
                EnvAdd, winW, %Xdistance%
            }
            else
            {
                EnvSub, winW, %Xdistance%
            }
        }
        else if newMouseX > %OLDmouseX%
        {
            ; mouse was moved to the right
            Xdistance = %newMouseX%
            EnvSub, Xdistance, %OLDmouseX%   
            if MousePosX = left ; mouse is on left side of window
            {
                EnvSub, winW, %Xdistance%
                EnvAdd, winX, %Xdistance%
            }
            else
            {
                EnvAdd, winW, %Xdistance%
            }
        }
        OLDmouseX = %newMouseX%
        if newMouseY < %OLDmouseY%
        {
            Ydistance = %OLDmouseY%
            EnvSub, Ydistance, %newMouseY%   
            if MousePosY = up ; mouse is on upper side of windows
            {
                EnvSub, winY, %Ydistance%
                EnvAdd, winH, %Ydistance%
            }
            else
            {
                EnvSub, winH, %Ydistance%
            }
        }
        else if newMouseY > %OLDmouseY%
        {
            Ydistance = %newMouseY%
            EnvSub, Ydistance, %OLDmouseY%   
            if MousePosY = up ; mouse is on upper side of windows
            {
                EnvAdd, winY, %Ydistance%
                EnvSub, winH, %Ydistance%
            }
            else
            {
                EnvAdd, winH, %Ydistance%
            }
        }
        OLDmouseY = %newMouseY%
        WinMove, ahk_id %WinID%,,%winX%,%winY%,%winW%,%winH%
    }
return