I need to split an image

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Graphics 800,600,0,2
SetBuffer BackBuffer()

Global imgOutName = "outBmp"

img = LoadImage("source.bmp")
tile = CreateImage(75,75)

DrawImage img,0,0

For y = 0 To 7
	For x = 0 To 7

		GrabImage tile,x*75, y*75
		SaveImage(tile,"c:"+imgOutName+Str(x)+Str(y)+".bmp")
	
	Next
Next


WaitKey()

End