[cellarius]

OK. As I wrote in the article, this is not normally the place to ask for things that you want the button to do - this is for the addition of the button, not more.

Anyway: This has nothing to do with PHP - all of this is Javascript. And to open a page in a new window, you would add something like

window.open("http://www.your-page.com/goes/here.html");

to the exec part of my code. Like so:

exec: function(editor){
	window.open("http://www.your-page.com/goes/here.html");
}

For the additional syntax of window.open just google that command. There's plenty of sites explaining that.