How to make a script that will open a website using default browser?

Is there is a way to make a script to open a website using a default browser? i have a button can be clicked using a physics box collider when i click it it will go to a website for example it will goto www.unity3d.com and the script can be either .JS or C# Dont use BOO please , because i never heard or never know what is boo and the programming language thanks for looking this question because i really need it for my game...