// JavaScript Document
function checkout() {
  var tennis = window.open('https://lovendeuce.intrac.com.au/tennis/checkout.cfm','tennis','height=540,width=423,left='+(screen.width-423)/2+',screenX='+(screen.width-
423)/2+',top='+(screen.height-540)/2+',screenY='+(screen.height-540)/2+',toolbar=no,menubar=no,location=no,directories=no,status=yes,resizable=yes,scrollbars=yes');
  tennis.focus();
}