[lubuntu] Scroll wheel Lubuntu

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http://ubuntuforums.org – Hio everyone, I've noticed the following thing: my scrollwheel works the other way around undr Lubuntu. When i scroll upwards on the mouse, the website pages, etc. scroll downwards and when i scroll downwards on the mousem, the pages, etc. go upwards. How can i switch this so that the scrollwheel movement correspond with webpages, etc.? My mouse: Logitech MX320/MX400 Lazser Mouse. All help will be very much appreciated! (Hardware)