Problem solved, here's the solution. I hope it helps somebody on a dark day:
<script type='text/javascript'>
var url = 'partofURL'+MYVARIABLE+'anotherpartofURL';
var jsi = "<" + "script type='text/javascript'"
jsi += " src='" + unescape(url) + "'></" + "script>";
document.open();
document.write(jsi);
document.close();
</script>
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