Income tax and corporate taxes generally speaking do not make a difference between online and offline activities.
Regarding value added taxes it depends on the goods which are provided and if they are delivered online or shipped. Especially if you are selling to customers residing in the EU, you should hire a consultant.
There are huge differences in taxes between the "Kantons". You can compare a Kanton with a state in the US. Every Kanton has its own tax law.
YouŽll find a quick information here:
http://www.swiss-tax.ch/
The site is available in English, just click on the flag in the upper right corner.