Button on\off(modifing a button...)

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If SetScroll can only be either True or False (1 or 0), you can simplify the code a little:
If MouseDown(1)
  If MX>711 and MX<790 and MY>0 and MY<17
    SetScroll = 1 - SetScroll ; This will toggle SetScroll between 0 and 1
  Endif
  While MouseDown(1)
  Wend
Endif