function switchLang(){
  var currentLocation = location.href;
  var urlswitch;
  if (currentLocation.indexOf("fr") > 0)  //if no querystring
    urlswitch = currentLocation.replace("/fr/","/en/");
  else
    urlswitch = currentLocation.replace("/en/","/fr/");
  location.replace(urlswitch);
}

// Header
document.write('<a href="http://www4.bmo.com/francais/"><img src="images/transparent.gif" alt="BMO Groupe financier - Banque officielle du patinage artistique  depuis 1997" width="222" height="60" id="logoLink" /></a>');
document.write('<a href="index.html"><img src="images/transparent.gif" alt="BMOpatinage.com" width="200" height="30" id="logoLink2" /></a>');
document.write('<ul id="headerLinks">');

<!-- Share Widget -->
if ((document.location.href.indexOf('https://') != 0)) { // only show on non-secure pages
	document.write('<li>');
	document.write('&nbsp;<img src="images/btn_addthis.gif" id="csButton" alt="Add This" />');
	document.write('</li>');
	document.write('<script type="text/javascript" src="scripts/shareWidget.js"></script>');
}
<!-- Share Widget -->
document.write('	<li><a href="javascript: switchLang();" title="english">english</a>&nbsp;|&nbsp;</li>');
document.write('	<li><a href="http://www.bmo.com/" title="BMO.com">BMO.com</a>&nbsp;|&nbsp;</li>');
document.write('</ul>');