To use the code on SSL pages simply change the src parameter to https://....., for example:
<!-- Embedded ParaChat: Insert the script below at the point on your page where you want the Click To Chat link to appear -->
<script type='text/javascript' src='https://testdrive.parachat.biz/include.js?domain=testdrive.parachat.biz'></script>
<script type='text/javascript' >
if(sWOTrackPage)sWOTrackPage();
</script>
<!-- End of embedded ParaChat -->