Mousewheel clicks

[fishbones]

Hello,

I'm very new to AutoIT, and I'm having trouble making a really simple script for a friend of mine.

His problem:

When he clicks his mousewheel, it clicks two times instead of one.

Yepp, that's all - and I couldn't figure out anything in AutoIT, I was thinking about making some sort of cooldown, so the other click wouldn't activate. Any help?

Btw, I don't even know if I'm posting on the correct board, sorry.

[Zedna]

#include <Misc.au3>
$dll = DllOpen("user32.dll")

While 1
  If _IsPressed("04", $dll) Then ; Middle mouse button (three-button mouse)
    MouseClick ("middle")
  EndIf
  Sleep(100)
WEnd

DllClose($dll)