Application.OpenURL

Description

Opens the url in a browser.

In the editor or standalone player this will open a new page in the default browser with the url. It will also bring the browser application to the front.

function Start () {
Application.OpenURL ("http://unity3d.com/");
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Start() {
        Application.OpenURL("http://unity3d.com/");
    }
}

Note: The web player is not supported from 5.4.0 onwards.