Dexxa optical ps/2 mouse model M-SBA66, windows 98

I have windows 98 on my laptop. On connecting a dexxa optical ps/2 mouse, model M-SBA66, I can not scroll with the wheel, nor get the side buttons to work. I have lost the installation floppy discs. I can't seem to find the drivers on net. Help anyone?

regards,

Rajeev.