How to fix Duplication URLS problem?

[eshban]

Hello. I am breaking my head about something that should be quite easy I quess. I have a dynamic website that caused a lot of duplicate content items.

htt​p:/​/ww​w.example.nl​/in​dex​.ph​p?o​pti​on=​com​_fo​rme​&It​emi​d=2​8&f​unc​=th​ank​you​&di​d=3​54&​fon​tst​yle​=f-​sma​lle​r

htt​p:/​/ww​w.example.nl​/in​dex​.ph​p?o​pti​on=​com​_fo​rme​&It​emi​d=2​8&c​olo​rst​yle​=gr​een

htt​p:/​/ww​w.example.nl​​/in​dex​.ph​p?o​pti​on=​com​_fo​rme​&It​emi​d=2​8&w​idt​hst​yle​=w-​wid​e

As you can see there are multiple variables in the url (and the combinations are many). As all these pages point to one article this causes a lot of duplicate content

Can anyone guide that how to fix this problem?

[gvre]

http://www.google.com/support/webmas...y?answer=66359
http://www.google.com/support/webmas...?answer=139066