Een variable toevoegen in een js source url

[ultddave]

<script type="text/javascript"> 

var myURL = window.location.href;

var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://emaxforms.formstack.com/forms/js.php/project_form?referrer=' + myURL;

document.getElementsByTagName('body')[0].appendChild(script);

</script>