ifwinexist, ahk_class IEFrame
{
    Winactivate
    send #{up} ;ensures correct resize.
    sleep 200 ;waits 0.2 Secs for resize to occur.
    y := (A_ScreenHeight*0.5) ;simply half the screen height.
    WinMove,,%y% ;move the window to position defined in line above.
}
Return