Hi!

I am looking for some home pages which selects their costumers by
their occupation. for example, on the home page it can be buttons such
as first time visitor, customer, dealer, retailer, wholesaler etc.
there must be at least 2 different category.

Here are some web sites that come to mind:

Sun:  (Developers, System Admins, Partners, Executives, Press)
http://www.sun.com/

Microsoft: (Home, IT Professionals, Developers, Partners, Journalists)
http://www.microsoft.com/

Apple: (Education, Creative, SmallBiz, Developer)
http://www.apple.com/

Macromedia: (Business, Government, Educators, Students, Partners,
Investors, Press)
http://www.macromedia.com/

Intel: (Home Computing, Business, Developer, Retailer/Provider)
http://www.intel.com/

Dell: Three categories with seven sub-categories
http://www.dell.com/us/en/gen/default.htm

IBM: (Home/Home Office, Small Business, Medium Business, Government,
Education)
http://www.ibm.com/us/

I hope that you find this information useful.  Please let me know if I
am able to be of additional assistance.