There are 2 ways the button link can display on a site new window and popup.

1. opens in a new window - see below code (1)
For LINK window use this but change the window size to suit yourself and your preferred browsers: <a onclick="var w=window.open(this.href, 'freecall', 'width=664,height=535,scrollbars,resizable'); w.focus(); return false;" href="http://www.freecallme.com.au/freecall/buildsafe/free-call.html"><img = copy the custom button PNG image below and surround it with this href ></a>