Hi Diodorus Siculus and spuds, thanks for your replies. I have a cd with the mouse but it will not auto run so I "opened" the cd and clicked on set-up which installed the driver but there are no instructions to configure the 4th. and 5th. buttons. Your link spuds reads exactly the same as the small user manual I have but that also does not mention the extra buttons!
Hope you read this QuickHare, I owe you an apology, just been running through the settings for the new mouse and there are settings for the fourth and fifth buttons, I do not know how I missed them, they are set as you say by default so I will leave them like that.
Thanks again to all of you for your help,
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