Help get center between two points

Hello I need to find the center of two points I am using this to get my first position:

Local $pos1 = MouseGetPos() ;CENTER OF AUTOSN

And This to get my second position:

Local $pos2 = MouseGetPos() ;CENTER OF SN

Here is where it would need to get the center:

Local $pos3 = $pos1 (what ever formula to get center) $pos2    ;I need help here


My code:

Local $pos1 = MouseGetPos() ;CENTER OF AUTOSN
_GDIPlus_Startup()
$hImageA =_GDIPlus_ImageLoadFromFile($fileJ) ;this is the SN
$hBitmapA = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImageA)
$x = 0
$y = 0
$result = _ImageSearch($hBitmapA, 1, $x, $y, 20, 0) ;Zero will search against your active screen
If $result > 0 Then
   ToolTip("FOUND SN",0,0)
   $go4 = 4
MouseMove($x, $y)
Local $pos2 = MouseGetPos() ;CENTER OF SN
_GDIPlus_ImageDispose($hImageA)
	_GDIPlus_Shutdown()
 Else
 ToolTip("CANT FIND SN",0,0)
  SLEEP(200)
  _GDIPlus_ImageDispose($hImageA)
	   _GDIPlus_Shutdown()
EndIf
Local $pos3 = $pos1 (what ever formula to get center) $pos2	;I need help here
mouseclick("Left",$pos3[0],$pos3[1],2)						 ;Should click center
sleep(200)
SEND("^c")
sleep(200)
Global $text2 = ClipGet() 
sleep(200)