How to make a Gui Button that when it is pressed the user goes to a website?

Yo i wanna make a button named Website and when the player is pressing on it his explorer (Mozilla,Internet Explorer etc...) will open with the link of a pre-choosed link...for example .

//So here is how to make the button (who doesnt know that ;)


//What should i write here??SO it can reject me to a website?


I believe it is:

`Application.OpenURL ("");`