Scroll by Pixels on FireFox webpage

[Asakor 0]

Screenshot

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Dim $Running

$Running = True
HotKeySet ("{F1}", "Stop")


While ($Running = True)
WinWaitActive("4walled - Google Chrome","")
MouseClick("left",63,339,1)
;Center of 1st Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",195,339,1)
;Center of 2nd Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",327,339,1)
;Center of 3rd Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",459,339,1)
;Center of 4th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",591,339,1)
;Center of 5th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",723,339,1)
;Center of 6th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",855,339,1)
;Center of 7th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",987,339,1)
;Center of 8th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",1119,339,1)
;Center of 9th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",1251,339,1)
;Center of 10th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",1383,339,1)
;Center of 11th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")

WinWaitActive("4walled - Google Chrome","")
MouseClick("left",1515,339,1)
;Center of 12th Thumbnail
WinWaitActive("4walled","")
MouseClick("right",818,165,1)
MouseClick("left",864,294,1)
WinWaitActive("Save As","")
Send("{ENTER}")
WinWaitActive("4walled","")
Send("{CTRLDOWN}w{CTRLUP}")
WEnd

Func Stop ()
    $Running = False

I have a script mostly typed out, I am trying to find a cmd line to allow me to literally scroll the webpage by X (74px) amount of pixels down.

What I am doing is opening a thumbnail (yellow Circle) to a image that I am saving. Closing the tab, and going to the next thumbnail to the right. Once I complete the line of links (images) I want to move the webpage up and then restart the progress.

I have been looking thru the GUIScrollBar cmds, only to get lost in the advanced coding. Only making out a few cmd lines.

Thanks for everyones time and effort.